It followed the resignation of a fourth Bectu member last October.
Our idea of a union is one in which members call the shots, he said.
Loach added: People in the industry are very vulnerable.

Ken LoachGetty
There are a lot of young people desperate to get experience and this leaves them open to exploitation.
People are joining Bectu because they see the need for a union, particularly younger members.
We need a clear voice so all the members can feel confident that it is their union.

Film set in Stockport
Loach argued that the Prospect officials tweet was defamatory.
The official later apologized and said his remark was inappropriate and without justification.
They remain Bectu members.
Sources said there were cultural differences on the NEC.
Theyve got no truck with creatives, said one source.
There is no guarantee that the women will be replaced with Bectu members.
Currently, just two of the 30-strong NEC hail from the creative industries.
Clancy and Philippa Childs, the head of Bectu, are said to have a good working relationship.
Clancys decision to keep the Bectu brand alive was welcomed by many.
Bectu members voted by a large majority to become part of Prospect, something which took place in 2017.