Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Incredible time capsule of late 60s Chicago

This film is a must-have for anyone interested in the sociology, history, and physical development of Chicago. Done in a neo-realist style using a mixture of professional and amateur actors, the story revolves around real scenes shot during the 1968 Democratic Convention and the "police riot" that ensued. The deus-ex-machina ending is a bit disappointing, but the street scenes and footage are mind-blowing for students of Chicago and its history.