Chairmen
- Mom Rajawongse Kukrit Pramoj (1974–1985)
- Air Chief Marshal Siddhi Savetsila (1985–1990)
- M.R. Kukrit Pramoj (again, shortly in 1990)
- Montri Pongpanich (1990–1998)
- Boonphan Kaewattana (1998–1999)
- Suwit Khunkitti (1999–2000)
Read more about this topic: Social Action Party