G. G. Ponnambalam, the Tamil nationalist counterpart of S. W. R. D. Bandaranaike, founded the All Ceylon Tamil Congress (ACTC) in 1944. Objecting to Ponnambalam's cooperation with D. S. Senanayake, a dissident group led by S.J.V. Chelvanayakam broke away in 1949 and formed the Illankai Tamil Arasu Kachchi (ITAK), also known as the Federal Party, becoming the main Tamil political party in Sri Lanka for next two decades. The Federal Party advocated a more aggressive stance toward the Sinhalese. With the constitutional reforms of 1972, the ACTC and ITAK created the Tamil United Front (later Tamil United Liberation Front). Following a period of turbulence as Tamil militants rose to power in the late 1970s, these Tamil political parties were succeeded in October 2001 by the Tamil National Alliance. Janatha Vimukthi Peramuna, a Marxist–Leninist political party founded by Rohana Wijeweera in 1965, serves as a third force in the current political context. It endorses leftist policies which are more radical than the traditionalist leftist politics of the LSSP and the Communist Party. Founded in 1981, the Sri Lanka Muslim Congress is the largest Muslim political party in Sri Lanka.