As the New York City Department of Investigation continues its three-year probe of the New York Police Department’s gang database, questions are being raised about the database’s constitutionality. To determine the constitutionality of the database, we have to look at the decades-long practice of criminalizing gangs in the United States and what implications it has had for policing. In order to prosecute gangs, the term itself must firstly be defined. Yet the term “gang” in U.S. law remains full of ambiguity. As such, while the penalties for alleged gang members are harsh, the grounds on which gang affiliation is determined are unclear—as is demonstrated by an analysis of gang-prosecution laws across the country.

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