Sangathalaivan (transl. Union Leader) is a 2021 Indian Tamil-language drama film written and directed by Manimaran. Based on the novel Thariyudan by Bharathinathan, the film stars Samuthirakani, Karunas and Ramya Subramanian in the lead roles. The music was composed by Robert Sargunam with cinematography by Srinivas Devamsam and editing by G. B. Venkatesh. Produced by Vetrimaaran via Grass Root Film Company, it was released on 26 February 2021.