I te 14 o Mei 1972 i whakatūria e te ITAK, All Ceylon Tamil Congress (ACTC), Ceylon Workers' Congress, Eelath Thamilar Otrumai Munnani me All Ceylon Tamil Conference te Tamil United Front, i muri mai ka whakaingoatia ko Tamil United Liberation Front (TULF). Ko Sampanthan te kaitono o te TULF i Trincomalee i te pooti pāremata 1977. I wikitoria ia i te pōtitanga, ā, i uru ki te Pāremata. Ko Sampanthan me era atu mema o te TULF i aukati i te Paremata mai i te waenganui o te 1983 mo nga take maha: i raro i te pehanga mai i nga hoia Tamil o Sri Lanka kia kaua e noho ki te Paremata i tua atu o to raatau waa ono tau; ko te Whakatikatika Ono o te Ture o Sri Lanka i whakahau kia oati ratou ki te oati kaore e utua te tautoko mo te kawanatanga motuhake; me te Hōngongoi Pango
i patua ai te 3,000 o ngā Tamils e ngā tini o ngā Sinhalese. I muri i nga marama e toru o te kore, ka ngaro a Sampanthan i tana nohoanga i te Paremata i te 7 o Mahuru 1983. I mahi a Sampanthan hei kaitiaki moni, perehitini tuarua me te hekeretari matua o TULF.