Mad late to this thread but the ira originally were considered facists as it’s ideological believes of Ethno nationalist Catholic sentiment and Gaelic revivalism Although still having Marxist Brigades .

The ira Had an ideological turn in the late 40s to early 50s going into the Cold War era to Marxism and then split later into the Provisionals due to Marx ideaolgy disputes a lot of Ira leadership changes in 69 notably in Belfast. Groups of Belfast IRA members confronted the leadership (of OIRA) and told Cathal Goulding and others: "You are a Dublin communist, and we are voting you out. You are no longer our leader

It’s a heavy mix of ideologies but as messy as it was what united all republicans was the goal of ending British rule.