Every worker wanting to join a strike picket could be forced to identify themselves to police, carry a letter of authorisation and wear an armband, under proposed reforms to trade union laws that could be in breach of international agreements, human rights groups have warned...The Trade Union Bill has already come in for heavy criticism after the Government published its plans without conducting an impact assessment. Campaigners are stepping up their efforts against it as public consultation closes on 9 September. Liberty said that demanding that all picketers hand over contact details to police would signal a “hark back to historical problems” between trade unions and the authorities.This was a reference to widespread allegations that the police and security services previously passed on names and contact details of trade union members to a database that firms consulted before offering people jobs.