The Irish National Liberation Army Belfast Brigade was the main brigade area of the Irish National Liberation Army (INLA). The other Brigade areas were in Derry City, south County Londonderry and County Armagh, with smaller units in Newry, east and west County Tyrone and south County Fermanagh. Formation The Irish National Liberation Army Belfast Brigade or simply INLA Belfast Brigade was a unit of the Irish Republican and Socialist Paramilitary organization the Irish National Liberation Army (INLA) that was based in Belfast. Along with the INLA's Derry and Armagh brigades the Belfast INLA was one of the most active in the organization during its 24 year paramilitary campaign. It was formed in 1975, a few months after the Irish National Liberation Army and the groups political wing the Irish Republican Socialist Party (IRSP) were themselves formed in Dublin in 1974 by the groups' leader Seamus Costello and his supporters. The INLA and IRSP were formed when Volunteers in the Official IRA (OIRA) left that group as they were frustrated with the progress it was making and the OIRA's 1972 ceasefire. In a 1975 interview for the IRSP's first edition of their newspaper called The Starry Plough, Seamus Costello claimed that in Belfast 200 members had left the Official Republican movement to join the new IRSP movement. Activity and actions The INLA Belfast Brigade's first actions were feuding with the Official IRA. Dissenters had left the group early in 1974 led by Paul Tinnelly (who formed the short-lived Tinnelly Brigade) and the OIRA moved quickly to crush that group and met little resistance. The OIRA hoped to do the same with the newly formed INLA which used the cover name People's Liberation Army (PLA) in its first few months. The OIRA met more stronger resistance from the INLA than they did with any other dissenters, this was mainly due to the support Costello had & how highly regarded he was among his followers & the size of the INLA. Most of the OIRA/INLA feud was played out in Belfast. Six people were killed in the feud and several others were injured, mainly from the OIRA. The highest-profile victim of the feud was Official IRA Belfast Brigade OC Billy McMillen who was rumored to have been killed by Gerard Steenson and Brendan McNamee (a former Provisional IRA volunteer) at Dunlewy Street near the Falls Road. INLA Volunteers also tried to kill an