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Postal workers in Lancashire are threatening to strike if they are told to deliver free copies of the Sun next week in protest against its coverage of the Hillsborough tragedy.
Union members at the Royal Mail depot in Skelmersdale, near Liverpool, have vowed to walk out if “any copies of the Sun cross the gates”.
In a statement given to the Liverpool Class Action website , they called the newspaper "s***e".
The newspaper is delivering 22 million free World Cup editions around the country on Thursday and Friday.
The Sun is still reviled in parts of Merseyside and among Liverpool fans for its coverage of the Hillsborough disaster.
Skelmersdale has a strong association with Liverpool and workers advocating the postal strike are understood to support the long-running “Don’t Buy the Sun ” campaign.
The Sun sparked outrage after the April 1989 tragedy where 96 people will killed and hundreds more injured.
Hillsborough disaster 25th anniversary: RIP to the 96Show all 50 1 /50Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Members of the Hillsborough Justice Campaign group march to Anfield for a memorial service marking the 25th anniversary of the Hillsborough Disaster at Anfield stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Members of the Hillsborough Justice Campaign group march to Anfield for a memorial service marking the 25th anniversary of the Hillsborough Disaster at Anfield stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A woman walks past a Hillsborough tribute banner as fans arrive in Anfield for a memorial service marking the 25th anniversary of the Hillsborough Disaster at Anfield stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A Liverpool fan wipes away tears during the Hillsborough 25th Anniversary Memorial Service at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A Liverpool fan reacts during the Hillsborough 25th Anniversary Memorial Service at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Members of the Hillsborough Justice Campaign group embrace as they arrive at Anfield for a memorial service marking the 25th anniversary of the Hillsborough Disaster at Anfield stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A man carrying flowers arrives at the Hillsborough Memorial at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary British member of parliament Andy Burnham (C) arrives to attend a memorial service to mark the 25th anniversary of the Hillsborough Disaster at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Members of the public and football fans gather together during the Hillsborough 25th Anniversary Memorial Service at Hillsborough, Sheffield
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Chairman Milan Mandaric lays a wreath during the Hillsborough 25th Anniversary Memorial Service at Hillsborough, Sheffield
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Fans lay flowers by the Shankly gates before a memorial service to mark the 25th anniversary of the Hillsborough disaster at Anfield in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Tommy Biggadike (2) whose grandfather Thomas Howard died in the tragedy arrives to lay flowers ahead of the Hillsborough 25th Anniversary Memorial Service at Hillsborough, Sheffield
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Members of the public lay flowers before the screening of the Hillsborough 25th Anniversary Memorial Service at Goodison Park in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Flowers are laid at the Hillsborough memorial outside Anfield to mark the 25th anniversary of the Hillsborough disaster in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Football scarves are tied on the Shankly Gates at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A mourner stands next to the scarfs which are tied to the Shankly gates outside Anfield to mark the 25th anniversary of the Hillsborough disaster in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A fan ties a scarf to the Shankly Gates at Anfield in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A Liverpool supporter looks at the tributes ahead of the Hillsborough 25th Anniversary Memorial Service at Hillsborough, Sheffield
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A man holds up a scarf remembering those who have died in football disasters over the years during a memorial service to mark the 25th anniversary of the Hillsborough Disaster at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Everton's Spanish manager Roberto Martinez (top row L) and Liverpool football club players Steven Gerrard (3L), Daniel Agger (4R), Luis Suarez (3R), Daniel Sturridge (2R) and Glen Johnson (R) stand above former Liverpool manager Kenny Dalglish (bottom 3L) and former Liverpool player Ian Rush (5L) during a memorial service to mark the 25th anniversary of the Hillsborough Disaster at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Liverpool's (left-right) Glen Johnson, Daniel Sturridge, Luis Suarez, Daniel Agger and Steven Gerrard arrive for the Hillsborough 25th Anniversary Memorial Service at Anfield Stadium, Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Liverpool football club captain Steven Gerrard arrives for a memorial service to mark the 25th anniversary of the Hillsborough Disaster at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Liverpool football club player Glen Johnson arrives for a memorial service to mark the 25th anniversary of the Hillsborough Disaster at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Scarfs and balloons are placed in front of the Kop stand on the Anfield pitch to mark the 25th anniversary of the Hillsborough disaster in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary The figure 96, made up of fans scarves, fills the centre circle before the Hillsborough 25th Anniversary Memorial Service at Anfield Stadium in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Hull City and Sheffield United players observe a minute of silence to mark the 25th anniversary for the Hillsborough disaster during the English FA Cup Semi-final match between Hull City and Sheffield United at Wembley Stadium in London
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary The crowd and players pause for a delayed kick off in memory of the victims of the Hillsborough disaster 25 years ago before the FA Cup Semi Final match at Wembley Stadium in London
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary The teams of Reading and Leicester City respect a minutes silence for the Hillsborough victims before the Sky Bet Championship match at the Madejski Stadium, Reading
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary The players take part in a minute silence to remember the Hillsborough disaster before the Sky Bet Championship match between Reading and Leicester City at the Madejski Stadium in Reading
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Liverpool scarves cover 96 seats in memory of the victims of the Hillsborough disaster 25 years ago during the FA Cup Semi Final match at Wembley Stadium in London
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary The crowd and players pause for a delayed kick off in memory of the victims of the Hillsborough disaster 25 years ago before the FA Cup Semi Final match at Wembley Stadium in London
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary The crowd and players pause for a delayed kick off in memory of the victims of the Hillsborough disaster 25 years ago before the FA Cup Semi Final match at Wembley Stadium in London
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Before their English Premier League soccer match at Anfield Stadium against Manchester City Liverpool supporters hold their scarves prior to a minute's silence in tribute to the 96 supporters who lost their lives in the Hillsborough disaster of 25 years ago in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Liverpool's Kenny Dalglish and Ian Rush receive wreath from Manchester City's Mike Summerbee (R ), Tony Book (L ) and Joe Corrigan (C back) to honour the ninety six Liverpool fans who lost their lives during an FA Cup semi final at Hillsborough in Sheffield 25 years ago, before the English Premier League soccer match between Liverpool vs Manchester City in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Liverpool fans hold up a banner in respect of the Hillsborough disaster ahead of their English Premier League soccer match against Manchester City at Anfield in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Before their English Premier League soccer match at Anfield Stadium against Manchester City Liverpool supporters hold banners prior to a minute's silence in tribute to the 96 supporters who lost their lives in the Hillsborough disaster of 25 years ago in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Jose Mourinho the Chelsea manager and his coaching staff observe a minute's silence to mark the 25th anniversary of the Hillsborough disaster prior to the Barclays Premier League match between Swansea City and Chelsea at Liberty Stadium in Swansea, Wales
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Captain Curtis Davies of Hull City carries a wreath to mark the 25th anniversary of the Hillsborough disaster prior to the FA Cup with Budweiser semi-final match between Hull City and Sheffield United at Wembley Stadium in London
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Fans in the Kop wave banners in memory of victims of the 1989 Hillsborough disaster before the English Premier League football match between Liverpool and Manchester City at Anfield in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Players from both teams line up for a minutes silence in front of fans in the kop displaying cards to form a message in remembrance of the 96 Liverpool fans that lost their lives in the Hillsborough disaster during the Barclays Premier League match at Anfield, Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A boy stands next to floral tributes laid in memory of the victims of the Hillsborough disaster, on the 25th anniversary of the tragedy prior to the Barclays Premier League match between Liverpool and Manchester City at Anfield in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary View of floral tributes laid in memory of the victims of the Hillsborough disaster, on the 25th anniversary of the tragedy prior to the Barclays Premier League match between Liverpool and Manchester City at Anfield in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary People lay floral tribute in memory of the victims of the Hillsborough disaster, on the 25th anniversary of the tragedy prior to the Barclays Premier League match between Liverpool and Manchester City at Anfield in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary View of club scarves placed in memory of the victims of the Hillsborough disaster in Liverpool
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Fabio Borini of Sunderland lays a floral wreath is laid on the pitch to mark the 25th anniversary of the Hillsborough disaster prior to the Barclays Premier League match between Sunderland and Everton at Stadium of Light in Sunderland
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A floral wreath is laid on the pitch to mark the 25th anniversary of the Hillsborough disaster prior to the Barclays Premier League match between Sunderland and Everton at Stadium of Light in Sunderland
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary A tribute is displayed on the scoreboard as a minute's silence is observed to mark the 25th anniversary of the Hillsborough disaster prior to the Barclays Premier League match between Crystal Palace and Aston Villa at Selhurst Park in London
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary 96 blue seats at the Leppings Lane end of Hillsborough are replaced by 96 white seats to represent the 96 Liverpool fans who died at the Hillsborough disaster, during the Sky Bet Championship match at Hillsborough, Sheffield
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Football spectators observe a minutes silence for the 25th Anniversary of the Hillsborough Disaster with a billboard in the background displaying the names of those who were killed, ahead of the English Premier League football match between Stoke City and Newcastle United at the Britannia Stadium in Stoke on Trent
Hillsborough disaster 25th anniversary: RIP to the 96 Hillsborough disaster anniversary Arsenal fans during a minutes remembrance next to the 96 seats that are being left empty as a tribute to the 96 Liverpool fans that lost their lives in the Hillsborough disaster, are seen before the FA Cup Semi Final match at Wembley Stadium in London
Under a banner headline which read “The Truth”, the paper claimed the fatal crush at Sheffield Wednesday's ground was caused by drunken Liverpool fans.
The story claimed that some stole from the pockets of the dead and urinated on police officers trying to rescue them.
Inquiries have since concluded that Liverpool fans were not responsible for the disaster and police had released misleading statements in the wake of the tragedy.
Sally Hopkins, a spokesperson for Royal Mail, said the Sun had already chosen not to include Liverpool in the mailing.
She added: “Any individual concerns will be handled sensitively with fairness, dignity and fully respecting the views of individuals.
“Local CWU representatives and delivery office managers will work together to agree sensible and amicable solutions.”
A spokesman for the Communication Workers' Union (CWU) said an official strike had not been called and the action was being taken by a group of staff.
"It's not a strike at the moment but a divisional officer is meeting with Royal Mail to discuss it," she added.
"Some staff members were at the Hillsborough disaster and had family there and they feel very strongly about it."
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