Former Labour leader Ed Miliband has accused the 'Leave' camp of trying to carry out a "fraud" on the British people in their efforts to get Britain to leave the European Union.
Mr Miliband believes the Brexit campaign is wooing Labour voters with its immigration rhetoric but really wants to abolish measures protecting workers' rights.
In a speech today he warned of a "bleak future" for workers if Britain leaves the EU.
Mr Miliband also used the opportunity to attack the Conservative party.
Mr Miliband's intervention coincided with the release of a report by former cabinet minister, Yvette Cooper, warning of the damage facing Labour heartlands if the "far right of the Conservative Party" gets its way.
The 'Britain Stronger In Europe' report released by Ms Cooper warns that Labour supporters will bear the brunt of austerity measures imposed as a result of a post-Brexit recession.
It also warns that a 'Leave' victory would result in the "far right of the Conservative Party" setting the agenda.
Today shadow home secretary Andy Burnham also warned of the "very real prospect" of a vote to leave in the referendum, while deputy leader Tom Watson acknowledged the vote would be close.