https://ja.wikipedia.org/wiki/%E8%A1%80%E3%81%AE%E3%83%A1%E3%83%BC%E3%83%87%E3%83%BC%E4%BA%8B%E4%BB%B6 Bloody May Day (血のメーデー事件, chi no mēdē jiken) refers to a day of disturbances and clashes between demonstrators and police primar…