In 1987, the INLA and its political wing, the IRSP came under attack from the Irish People's Liberation Organisation (IPLO), an organisation founded by people who had resigned or been expelled from the INLA. The IPLO's initial aim was to destroy the IRSM and replace it with their organisation. Five members of the INLA and IRSP were killed by the IPLO, including leaders Ta Power and John O'Reilly. The INLA retaliated with several killings of their own. After the INLA killed the IPLO's leader, Gerard Steenson, a truce was reached. Although severely damaged by the IPLO's attacks, the INLA continued to exist. The IPLO, which was heavily involved in drug dealing, was put out of existence by the Provisional IRA in a large scale operation in 1992.