The accidental explosion of a Greenwich Village townhouse during a bomb-making session in 1970 left the Weather Underground– a radical left organization formed in 1969– distraught. In an attempt to reunify under their original goals at the time of formation, the group published a book, Prairie Fire: The Politics of Revolutionary Anti-imperialism. The book was intended to make a plan for organizing not just within the WU, but also with other radical left groups, and share ideologies, tactics, and lessons, all under the umbrella of anti-imperialism.