Following the failure of the border campaign 1956-62, the IRA leadership began to foresee the necessity of moving away from a narrow militarist strategy and pay attention to material concerns of people such as housing, unemployment and public services. Examples from places like Cuba and Vietnam showed that successful national liberation movements could be built from combining socialists and anti-imperialists. Increasingly the IRA became involved in the Dublin Housing Action Committees and industrial disputes. This helped win new Republican supporters among young left radicals and working class people. But not everyone was happy. Fianna Fáil was disturbed that the Republican movement was now criticising their economic policies and getting involved in campaigns against their landlord friends and business pals. Some of the more traditional republicans were also concerned that the IRA were neglecting the armed struggle in favour of street politics. Some conspiracy theorists in the Republican movements even believed leading IRA figures like Cathal Goulding were being brainwashed by communists. Fianna Fáil also tried to claim the IRA was being taken over by communists. Although before the 1969 general election Fianna Fáil also tried to claim the Labour Party was run by Chairman Mao.
The events of 1969 saw Fianna Fáil gombeen men and conservative republicans join together. The conservative republicans who would form the Provisional IRA essentially just wanted a 32 county version of catholic Ireland rather than a revolution. Fianna Fáil offered money and arms to right wing republicans on the basis they abandoned socialist politics and overthrew the leadership. Money was put in IRA accounts in banks in border towns that only right wing republicans had access too.
Looking at the demographics of the split, it seems to confirm the theory that Fianna Fáil spawned the provos. Younger, better educated and more progressive Republicans stuck with the Officials. Older, conservative, more religious and rural republicans were more likely to support the provisionals. Fianna Fáil was delighted with the provos because they returned the focus of struggle to the 6 counties and they stopped trying to change the gombeen Free State. Given the type of people who formed the provos it was inevitable they would become involved in sectarian murder and mindless killings. The likes of Ruairi O Bradaigh and Sean Mac Stiofain backed up by gombeen Fianna Fáil would create a monster. The provos were FF's Frankenstein's Monster.