Provisional IRA bomb attacks in Belfast , on July 21 , 1972 ( known as Bloody Friday ) killed seven civilians and two soldiers , and left 130 injured . McGuire subsequently decided to leave the Provisional IRA . She was told by the authorities if she did so she would receive Special Branch protection . In the late summer of 1972 she appeared in London and wrote a series of articles for '' The Observer '' , went into hiding , and wrote a book about her experiences in the organisation called '' To Take Arms : A Year in the Provisional IRA '' which was published in 1973 . In it she was hostile to Seán Mac Stíofáin , IRA Chief of Staff at the time she was a member , but remained sympathetic to Ó Conaill , and wished him success in internal struggles against Mac Stíofáin in the Republican movement
Bloody Friday
Bloody Friday (1972)
Maria Gatland