Rubuta ci gaba don wannan sakin layi - A ranar 14 ga Mayu 1972 ITAK, All Ceylon Tamil Congress (ACTC), Ceylon Workers 'Congress, Eelath Thamilar Otrumai Munnani da All Ceylon Tamil Conference sun kafa Tamil United Front, wanda daga baya aka sake masa suna Tamil United Liberation Front (TULF). Sampanthan ya kasance dan takarar TULF a Trincomalee a zaben 'yan majalisa na 1977. Ya lashe zaben kuma ya shiga majalisar. Sampanthan da duk sauran 'yan majalisar TULF sun kaurace wa majalisar daga tsakiyar 1983 saboda dalilai da yawa: suna karkashin matsin lamba daga mayakan Tamil na Sri Lanka don kada su ci gaba da zama a majalisar bayan wa'adin su na shekaru shida; Kwaskwarima na shida ga Kundin Tsarin Mulki na Sri Lanka ya bukace su da su rantse da rantsuwa ba tare da wata bukata ba don tallafawa wata ƙasa daban; da kuma Black Yuli
rikicin da har zuwa 3,000 Tamils aka kashe da Sinhalese mobs. Bayan watanni uku na rashi, Sampanthan ya rasa kujerarsa a majalisar a ranar 7 ga Satumba, 1983. Sampanthan ya yi aiki a matsayin mai ba da gudummawar kuɗi, mataimakin shugaban kasa da babban sakataren TULF.