The Provisional IRA was not marxist (which is what was pictured).
The PIRA split from the Official IRA in December 1969 specifically to reject the Officials' explicit shift to marxism-leninism, class struggle politics, and alliances with communist groups.
The Provos were traditional Irish republicans focused on armed struggle for national unification and ending British rule. They used vague "democratic socialist republic" rhetoric, but lacked any coherent marxist ideology or analysis, unlike the Officials, who openly embraced it.
-Grok
The IRA are Reds, read a book please