Question: Which organization did both Billy McMillen and the Irish National Liberation army have affiliations with until 'the Troubles' 1974?
Sentence (from "Billy McMillen"): Liam "Billy" McMillen (19 May 1927 – 28 April 1975) was an Irish republican activist and an officer of the Official Irish Republican Army (OIRA) from Belfast, Northern Ireland.
Relevant evidence: Yes