There have been several mob-related violent incidents in this neighborhood recently.

mob 是名词，指"暴民、乌合之众"，在犯罪语境中特指"犯罪团伙、黑帮"。 related 是动词 relate 的过去分词，意思是"相关的、有联系的"。 mob-related 是由名词 mob 和形容词 related 组成的复合形容词，表示"与黑帮有关的"。