detonated about 20 pipe bombs – mainly targeting government buildings, electric power facilities, Safeway stores, and companies accused of racism. In 1977, Newton returned from exile in Cuba. Shortly afterward, Elaine Brown resigned from the party and fled to Los Angeles. The Party fell apart, leaving only a few members. MOVE developed in Philadelphia in 1972 as the "Christian Movement for Life", a communal living group based on Black Liberation principles. When police raided their house in 1978, a firefight broke out; during the shootout, one officer was killed, seven other police officers, five firefighters, three MOVE members, and three bystanders were also injured. In another high-profile incident of the Black Liberation Army, Assata Shakur, Zayd Shakur and Sundiata Acoli were said to have opened fire on state troopers in New Jersey after being pulled over for a broken taillight. Zayd Shakur and state trooper Werner Foerster were both killed during the exchange. Following her capture, Assata Shakur was tried in six different criminal trials. According to Shakur, she was beaten and tortured during her incarceration in a number of different federal and state prisons. The charges ranged from kidnapping to assault and battery to bank robbery. Assata Shakur was found guilty of the murder of both Foerster and her companion Zayd Shakur, but escaped prison in 1979 and eventually fled to Cuba and received political asylum. Acoli was convicted of killing Foerster and sentenced to life in prison. In 1978 a group of Black Liberation Army and Weather Underground members formed the May 19th Communist Organization, or M19CO. It also included members of the Black Panthers and the Republic of New Africa. In 1979 three M19CO members walked into the visitor's center at the Clinton Correctional Facility for Women near Clinton, New Jersey. They took two guards hostage and freed Shakur. Several months later M19CO arranged for the escape of William Morales, a member of Puerto Rican separatist group Fuerzas Armadas de Liberación Nacional Puertorriqueña from Bellevue Hospital in New York City, where he was recovering after a bomb he was building exploded in his hands. Decline in the 1980s Over the 1980s the Black Power movement continued despite a decline in its popularity and organization memberships. The Black Liberation Army was active in the US until at least 1981 when a Brinks truck robbery, conducted with support from former Weather Underground members Kathy Boudin and David Gilbert, left