Laquan mcdonald
One activist called on people to "rise up" and shut down the Magnificent Mile shopping area on Friday.
City officials have framed the cop who killed McDonald as one bad apple, but the department has been rotten for almost a century.
Tensions between residents and police are high in the Windy City.
WHAT'S HAPPENING
The president said he was "deeply disturbed" by video of Laquan McDonald's killing.
The Chicago mayor must be held accountable for obstructing justice for Laquan McDonald, activists say.
The group pried loose shocking dashcam video showing the police killing of Laquan McDonald, 17.
The city's police department has a long history of failing to hold its officers accountable.
"We cannot go on like this."