The May 19 Communist Organization , also known as the May 19th Coalition and the May 19 Communist Movement , was a self-described revolutionary organization formed by splintered-off members of the Weather Underground . Originally known as the New York Chapter of the Prairie Fire Organizing Committee ( PFOC ) , the group was active from 1978 to 1985 . Between 1983 and 1985 , the group bombed the United States Senate as well as three military installations in the Washington D.C. area and four sites in New York City
bombed the United States Senate
1983 United States Senate bombing
Laura Whitehorn