This series consists of correspondence, memoranda, legal documents, concerning Harrison's personal life, family history, and his defense against gunrunning charges in the U.S. vs. Harrison, Falvey, Mullen, Gormley, and Flannery case. Of note are speeches made by Harrison, a July 1983 application for a pistol permit, correspondence from Harrison's co-workers at Brinks, a book about the trial by Thomas Cox, and the October 1982 testimony of Bernadette Devlin McAliskey, a character witness at the trial.

Materials in this series include minutes, financial records, correspondence, and memoranda concerning a variety of domestic, Irish, and international political organizations Harrison belonged to, including Hands Off Cuba Coalition, the National Alliance Against Racist and Political Repression, and the Committee in Solidarity with Vietnam, Cambodia, and Laos. Although international in scope, much of the material documents Harrison's involvement with Irish and Irish American organizations, including his speech at a New York H-Block Armagh Committee rally; his work with the National Graves Association to provide memorials for Irish Republicans; his association with Republican Sinn Fein (also known as Sinn Fein Poblachtach), including letters from organizer Daithi O'Connell; his affiliation with the Irish American Defense Fund, which raised money during the 1980s for the legal defense of Irish Republican sympathizers facing criminal trial and deportation proceedings in American courts.

Materials in this series include pamphlets and other publications produced by a variety of domestic, Irish, and international political organizations Harrison belonged to. Major topics concern Irish Republicanism, the treatment of prisoners, and international liberation movements.

Materials in this series include flyers, posters, and publications concerning American political campaigns, Irish Republicanism, and international liberation movements.

This series contains photographs of George Harrison's family and friends, in addition to politicians like Paul O'Dwyer and President Bill Clinton. Of note is a photograph of Bernadette Devlin McAliskey, a character witness at Harrison's trial.

This series consists of t-shirts, approximately 200 buttons, and other material objects acquired by Harrison beginning in the 1970s documenting anti-apartheid efforts in South Africa; anti-war and disarmament; and liberation movements in Ireland, El Salvador, Nicaragua, Panama, Peru, Puerto Rico, Namibia, Palestine, Korea, and Cuba. The buttons also reflect Harrison's support for organized labor and union strikes, notably that against Eastern Airlines, and American political campaigns, including Jesse Jackson and David Dinkins. Posters and artwork commemorating members of the Irish republican movement from the 18th century through the 20th century, the 60th anniversary of the Abraham Lincoln Brigade, Harrison's membership in the Wolfe Tone and the Ninety Eight Memorial Association, and the Michael Flannery Memorial Award.

Items added to this series in 2017 date from 1988 to 1992 and include posters related to liberation movements in South Africa, Cuba, Latin America, and Palestine, and anti-nuclear disarmament. They also include pieces of memorabilia including a ticket-stub from a 1991 Nelson Mandela rally in New York City.