Two others were also suspended and six more members faced disciplinary measures.
But the judgment, seen by Deadline, said the punishment of suspension did not fit the crime.
Prospects disciplinary panel gave insufficient weight to the context in which WPD branch officers made their decision.
Ken Loach has been reinstated as a Bectu officerGetty/Bectu
Loach said the allegation was groundless and Prospect had not produced evidence to support its claim.
Sources said WPD branch members are viewed as troublemakers by Prospect and have been unfairly targeted by Clancy.
He saw an opportunity to get rid of the most vocal people at Bectu.
It was a hostile act, said a source familiar with the matter.
We live to fight another day.
Prospect did little to calm tensions in a statement to Deadline.
The NACs judgement contains multiple and clear criticisms of the branchs actions.
He won a BAFTA fellowship in 2006 and his 1969 featureKesis considered one of the greatest ever British films.
