Unions said to be restricting affiliated supporters' data to preferred candidates.
The new party of the left, Left Unity, launched its manifesto at a squat in Soho with a speech by Ken Loach condemning the main parties.
Allowing members of members of affiliated unions to become Affiliated Supporters will give them the chance to shape the party's future.
It is farcical that the employment regulations that MPs put into law are not accessible to their own staff.
While many pay lip service to the need for higher wages, the RMT general secretary was prepared to take the action required to secure them.
After today's comfortable victory, far greater political and financial challenges lie ahead for the party.
The Labour leader's message: the reforms will get working people back into politics, transfer power from MPs to party members, and help turn Labour into a movement again.
The Labour leader says "there’s a big, big contrast between us as an expanding party and the Tories".
Twenty years ago, John Prescott persuaded sceptical delegates to back John Smith's trade union reforms, but who will fulfil this role for Miliband at March's special conference?