Sean Matgamna, also known as John O'Mahony, (born 1941, Ennis, County Clare, Ireland) is a Trotskyist theorist and activist. He was a founder of Workers' Fight in 1966 and is still a prominent member of the group, now called the Alliance for Workers' Liberty.
Read more about Sean Matgamna: Early Political Experience, Workers' Fight, "Third Camp" Position, Pseudonyms