The PIRA were a terrorist organisation featured in Patriot Games and Rainbow Six. In Patriot Games, former PIRA members joined the ULA, the main antagonist of the novel. PIRA representatives publicly condemned the ULA's attack on the Prince and Princess of Wales, and the baby Prince William, and a member of the organisation met with an operative of the British security services. Senior PIRA members were killed by the ULA in the USA, who had intended to kill Jack Ryan and his family.
In Rainbow Six, the PIRA has changed its outlook significantly, going so far as to demand large quantities of medical-grade cocaine (with a street value of upwards of $15,000,000) as partial payment for the attack on Rainbow that leaves several of its operatives dead.