The arrests followed 'chaotic' scenes at a public house in Waterloo, south London, after a concert by the band Blood and Honour was cancelled at the last minute on Saturday.
At Horseferry Road magistrates' court in London Marlene Anderson, for the prosecution, said that the scheduled concert at Becontree, Essex, had attracted hundreds of 'fascists and skinheads from all over Europe'.
Five men were charged with assault, criminal damage and public order offences. The magistrate, Geoffrey Breen, heard that Steve Cirock, 22, and Eddy Vanryckeghem, 28, from Belgium, and Stefan Johannsen, 29, from Germany, had come to London especially to see the rock band, which helps fund the British National Party.
He told them: 'You must return to your homes within 24 hours and you must not come back to the UK otherwise than for your scheduled court appearances.'
Darryl Ross, 19, of Southampton, charged with violent disorder and inflicting grievous bodily harm on PC Carey Abbott, was granted bail conditional on a curfew.
Robin Gray, 31, of Staines, Middlesex, charged with violent disorder and assault on PC Paul Stevenson, was granted unconditional bail.