The neighborhood became less safe due to violent acts by several gangbangers.

gangbangers 是 gangbanger 的复数形式。gang 指"帮派、团伙"，banger 原指"发出巨响的东西"，在俚语中常指"枪支"或"暴力分子"。 gangbanger 是俚语，指"参与帮派暴力活动的人"，特指那些携带武器、参与街头斗殴的帮派成员。