He was imprisoned in Long Kesh , and was released on 4 October 1974 .
He was charged with membership of the Provisional IRA , and received a three - year sentence when he became the first person to be convicted of the offence .
person was imprisoned in Long Kesh , and was released on 4 October 1974 .
He was charged with membership of the Provisional IRA , and received a three - year sentence when he became the first person to be convicted of the offence .