The organization that was trying to make Ireland socialist lost members who disagreed with them to form what movement?
Armalite and ballot box strategy:  This strategy was a matter of some controversy within republicanism; some IRA members and supporters who disagreed with the strategy left to form Republican Sinn Féin in 1986. Provisional Irish Republican Army: The Provisional Irish Republican Army (Provisional IRA) was an Irish republican paramilitary organization that sought to remove Northern Ireland from the United Kingdom and to bring about an independent socialist republic encompassing all of Ireland.
Republican Sinn Féin