High Quality Content by WIKIPEDIA articles! The International Association of Fire Fighters (IAFF) is a labor union representing professional firefighters in the United States and Canada. The IAFF was formed in 1918 and is affiliated with the AFL-CIO in the United States and the Canadian Labour Congress in Canada. The IAFF is headquartered in Washington, D.C. and has some 298,000 members in more than 3,200 locals and affiliates in every U.S. state and in Canada.