The curfew didn't exist at that time. And it's a sign of piss-poor management and policing; a band-aid solution.
NYC administration thought of a similar thing when its crime rates were up, yet rejected the idea in the end. Many other cities also manage to survive without a discriminatory youth curfew.
Reading about the curfew makes me want to donate to the "Free Mumia" fund. Not because Mumia was innocent, but as a ****-you to the scum who make and enforce the laws in Filthydelphia and Pennsyltucky in general