According to the Guardian:
The GMB’s executive said in a statement: “The executive noted that over a quarter of motions to GMB congress from branches across the whole of the UK relate to the political stance of the union.
“The executive determined that the union’s relations with the Labour party and what GMB members expect and want from the party will form a major plank in the debate at GMB congress in Brighton in June.
“The executive expressed concern and disappointment with recent statements made by senior party officials and registered their growing frustration at the lack of a cohesive policy to protect working people from the ravages of the Tory-led coalition government.”
A union source said the number of motions on links with Labour was “unprecedented” and ranged from stepping up efforts to “reclaim” Labour, to “walking away” from it.
The GMB gives Labour more than £2m a year in affiliation fees and other funds, making it the third largest union donor to the party.
More from LabourList
Assisted dying vote tracker: How does each Labour MP plan to vote on bill?
Labour mayors to be made more accountable to party
Revealed: Labour to ensure ‘high standards of governance and democracy’ in socialist societies via annual check-ins