Blow To Corbyn As GMB Union Backs Rival

The third biggest union has backed Owen Smith in the Labour leadership in a blow to Jeremy Corbyn. The 600,000-strong GMB has officially endorsed the the former shadow work and pensions secretary in a significant boost to his campaign. Mr Smith had not been expected to win the backing of the big unions and the GMB had stood firmly by Mr Corbyn during the attempt to oust him in the wake of the EU referendum vote.