Adnan Hussain, an independent MP, has withdrawn from the steering process of the new political project, Your Party.
His departure, announced on Friday, occurs barely two weeks before the party's founding conference is due to take place in Liverpool.
Hussain cited “veiled prejudice” against Muslim men and “persistent infighting, factional competition, and a struggle for power” as his reasons for stepping back.
He expressed deep concern over the treatment of “certain figures”, particularly Muslim men, within the party, noting rhetoric disturbingly similar to forces the left claims to oppose.
The party, backed by Jeremy Corbyn and Zarah Sultana, has been marred by internal divisions, including disputes over leadership, financing, and its membership launch.