Vietnam War era
But how shall we educate men to goodness, to a sense of one another, to a love of the truth? And more urgently, how shall we do this in a bad time?
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. In 1967, Berrigan witnessed the public outcry that followed from the arrest of his brother Philip, for pouring blood on draft records as part of the Baltimore Four. Philip was sentenced to six years in prison for defacing government property. The fallout he had to endure from these many interventions, including his support for prisoners of war and, in 1968, seeing firsthand the conditions on the ground in Vietnam, further radicalized Berrigan, or at least strengthened his determination to resist American military imperialism.
Berrigan traveled to Hanoi with Howard Zinn during the Tet Offensive in January 1968 to "receive" three American airmen, the first American prisoners of war released by the North Vietnamese since the US bombing of that nation had begun.
In 1968, he signed the Writers and Editors War Tax Protest pledge, vowing to refuse to make tax payments in protest of the Vietnam War. In the same year, he was interviewed in the anti-Vietnam War documentary film In the Year of the Pig, and later that year became involved in radical non-violent protest.
Daniel Berrigan and his brother Philip, along with seven other Catholic protesters, used homemade napalm to destroy 378 draft files in the parking lot of the Catonsville, Maryland, draft board on May 17, 1968. This group, which came to be known as the Catonsville Nine, issued a statement after the incident:
We confront the Roman Catholic Church, other Christian bodies, and the synagogues of America with their silence and cowardice in the face of our country's crimes. We are convinced that the religious bureaucracy in this country is racist, is an accomplice in this war, and is hostile to the poor.
Berrigan was arrested and sentenced to three years in prison, but went into hiding with the help of fellow radicals prior to imprisonment. While on the run, Berrigan was interviewed for Lee Lockwood's documentary The Holy Outlaw. The Federal Bureau of Investigation apprehended him on August 11, 1970, at the home of William Stringfellow and Anthony Towne on Block Island. Berrigan was then imprisoned at the Federal Correctional Institution in Danbury, Connecticut, until his release on February 24, 1972.
In retrospect, the trial of the Catonsville Nine was significant, because it "altered resistance to the Vietnam War, moving activists from street protests to repeated acts of civil disobedience, including the burning of draft cards". As The New York Times noted in its obituary, Berrigan's actions helped "shape the tactics of opposition to the Vietnam War."