 He then started practising law in Jaffna.Yogeswaran was an active member of the Illankai Tamil Arasu Kachchi (Federal Party) and its youth wing.On 14 May 1972 the ITAK, All Ceylon Tamil Congress, Ceylon Workers' Congress, Eelath Thamilar Otrumai Munnani and All Ceylon Tamil Conference formed the Tamil United Front, later renamed Tamil United Liberation Front (TULF).