en.wikipedia.org/wiki/Aomori_Nebuta_Matsuri
Karasu-zoku (カラス族?, lit. "crow gang") refers to groups of vagrant participants who try to disrupt the festival. They enter the festival wearing black costumes instead of the formal haneto costumes, leading to the nickname "crow gang" or simply, "crows." The group may also be called "crow haneto," but their appearance and actions are not fitting of the name haneto, and the regional media does not include the word in their descriptions. They are classified as a type of foot-borne bōsōzoku.