... He has said in the face of a "morally bankrupt" government the union is to consult its members about putting up union candidates in future general elections.
Mark Serwotka said they had been considering the prospect for some time, because it was concerning that on many big issues all the main parties agreed, for example with privatising post offices.
One hundred years after the unions decided it needed a labour party to represent the people, the left of the party had effectively been silenced, he said.
"We will ballot members on whether the time has come to intervene directly," he told BBC Radio Four's Today programme.
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