Berrigan and Trappist monk Thomas Merton founded an interfaith coalition against the Vietnam War and wrote letters to major newspapers arguing for an end to the war .
Berrigan is his brother and Josephite priest Philip Berrigan .
Berrigan , his brother and Josephite priest Philip Berrigan , and Trappist monk Thomas Merton founded an interfaith coalition against the Vietnam War and wrote letters to major newspapers arguing for an end to the war .