1985 - The bombing of MOVE
The black liberation group MOVE was founded in 1972 by John Africa (born Vincent Leaphart). Living communally in a house in West Philadelphia, members of MOVE all changed their surnames to Africa, shunned modern technology and materialism, and preached support of animal rights, revolution and a return to nature.

Their first conflict with law enforcement occurred in 1978, when police tried to evict them from their house. A firefight erupted, killing one police officer and injuring several more on both sides.
Nine members of the group were sentenced to 100 years in prison for the officer’s killing. In 1981, the group moved to a row house on Osage Avenue.
At their new headquarters, MOVE members boarded up the windows, built a fortified rooftop bunker and broadcasted profanity-laced political lectures with bullhorns at all hours, drawing complaints from neighbors. Members continued to rack up violations from contempt of court to illegal possession of firearms, to the point where they were considered a terrorist organization by the mayor and police commissioner.
On the morning of May 13, 1985, the police moved on the house.
Arriving with arrest warrants for four residents of the house, the police ordered them to come out peacefully. Before long, shooting began.
In response to gunfire from inside the house, more than 500 police officers discharged over 10,000 rounds of ammunition in 90 minutes. The house was hit with high-pressure firehoses and tear gas, but MOVE did not surrender.
Despite pleas for deescalation to the mayor from City Council President Joseph Coleman and State Senator Hardy Williams, Police Commissioner Gregore Sambor gave the order to bomb the house.
By the time it was extinguished four hours later, 61 houses had been razed. Apart from a woman and 13-year-old boy who escaped when the fire started, everyone in the MOVE house was dead.
The 11 deaths included MOVE founder John Africa, five adults and five children between the ages of seven and 13.
Despite investigations and formal apologies, neither the mayor, nor the police commissioner, nor anyone else from the city was criminally charged.
Source: https://mashable.com/2016/01/10/1985-move-bombing/#D4k9iFRTskqN
Resource: Philadelphia Move Bombing Documentary