Lanzetta v. New Jersey

Background

A New Jersey law declared anyone "known to be a member of any gang consisting of two or more persons" who also had certain prior convictions to be a "gangster," punishable by large fines or long prison terms. Several people were indicted, tried, convicted, and sentenced under that clause, and New Jersey courts upheld the convictions by relying on earlier state decisions that tried to explain the word "gang."

Reasoning

The Court addressed whether the statute, on its face, violated the Fourteenth Amendment’s protection of due process because it was too vague. The opinion explains that the word "gang" has many meanings in dictionaries and social writings, and the statute says nothing clear about what membership means or how it is proved. The phrase "known to be a member" could mean actual membership or mere reputation, and the law does not identify any specific act or way to join a group. Because the law failed to give ordinary people fair notice of what conduct was forbidden, the Court held the provision void for vagueness and reversed the convictions.

Real world impact

The ruling prevents enforcement of that New Jersey provision as written and reverses the convictions before the Court. It warns that criminal laws must clearly define prohibited conduct or membership; otherwise people cannot be punished under such vague statutes. Prosecutors and legislatures must use clear language if they want to criminalize group-based conduct.