Conversation so far:
What are Ken Loach affliiations?
Ken Loach first joined the Labour Party from the early 1960s.
What is the Labour Party?
The Labour Party is a centre-left political party in the United Kingdom that has been described as an alliance of social democrats, democratic socialists and trade unionists.
What other affiliations did Ken Loach have?
During the 1960s and 1970s, Ken Loach was associated with (or a member of) the Socialist Labour League
Does Ken Loach have any more affiliations?
During the 1960s and 1970s, Ken Loach was associated with the International Socialists.
Name another one of Ken Loach's affliations?
During the 1960s and 1970s, Ken Loach was associated with the International Marxist Group.
Was Ken Loach a part of any other affiliations before 2015?
Ken Loach was involved in Respect - The Unity Coalition from its beginnings in January 2004.

Question: What was his biggest affiliation?
Self-contained rewrite: What was Ken Loach's biggest affiliation?