In Police Department of Chicago v. Moseley (1972) the Supreme Court struck down an ordinance that prohibited picketing within 150 feet of any school building while classes were in session because:
O The regulation allowed for protesters to be too close to school buildings and would disrupt classroom teaching.
O The regulation exempted union picketing and therefore was not content neutral.
O The government could have achieved its goals even if picketers were just 100 feet away from buildings.
O The regulation applied to all picketing but should have made an exception for union picketing involving teacher strikes.
O The regulation did not ensure adequate access to the intended audience.