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Peter Taaffe was a founder of Militant whose members were ejected from Labour in the 1980s.

He is now leader of the Socialist Party and told the World at One's Martha Kearney that the Labour Party needed to be reconfigured to be less top down, bureaucratic and less "in the Stalinist mould of Tom Watson".

Labour's deputy leader Tom Watson has warned of "proscribed organisations" attempting to join the party, in particular members of the Socialist Party.

Mr Taaffe said the Socialist Party wanted "to be part of the process of regenerating" Labour, from inside the party.

(Photo: Peter Taaffe)