Union Leader) is a 2021 Indian Tamil-language action drama film written and directed by Manimaran.

Based on the novel Thariyudan by Bharathinathan,[1] 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.

One day at the mill, Divya, Kalyani's friend, severs her lower arm after the equipment suddenly drags her saree.

Govindarajan gets Divya's father drunk, gets his thumbprint on documents, and pays him three lakhs.

However, Rangan decides to tell the truth in court, sending Govindarajan to jail.

Rangan helps around the farm and joins the union, attending secret meetings and planning strikes.

Kalyani meets with Rangan and tells him that her mother is finding a groom for her and that he should ask for a share from his family to start a business.

As Govindarajan's associates escape, the gang surrounds and kills him, avenging Rangan's death.

Based on the novel Thariyudan, the story was to be set in the areas of Salem, Erode and Tirupur, and was said to focus on the lives of handloom weavers and the struggles they face.

A critic from The Hindu noted "this idealistic take on an ideology lacks verve" and that the film "fails to sell its politics convincingly".

[9][10] A reviewer from The Times of India stated "despite having a few interestingly-written characters, Sangathalaivan is another half-baked attempt which relies more on conveying ideologies.

The editing is shoddy and we get the feel that several scenes were chopped off to speed up the proceedings.

"[13] Likewise, Cinema Express noted it was "a slow-burn drama that give us the pleasant feeling of reading a novel from the 90s.