Past incidents drove the crackdown: about 500 teens swarmed downtown Oak Park last Halloween, while a May takeover in Long Branch drew hundreds and ended with fights and six arrests.
Chicago remains a key warning sign after large teen crowds flooded the Loop and fights broke out before curfew enforcement dispersed them; some Hyde Park adults now plan to patrol 53rd Street in orange shirts.
Police say Halloween already multiplies call volume by four to six times, and social-media-fueled teen gatherings further stretch officers and raise risks of violence, fireworks complaints and missing-child calls.