1. the act of any person taking part together with others in any disturbances of the public peace (whether in connection with a strike or lock-out or not) not being an occurrence mentioned in condition 2 of the Special Conditions hereof,
2. the action of any lawfully constituted authority in suppressing or attempting to suppress any such disturbance or in minimizing the consequences of any such disturbance,
3. the willful act of any striker or locked-out worker done in furtherance of a strike or in resistance to a lock-out,
4. the action of any lawfully constituted authority in preventing or attempting to prevent any such act or in minimizing the consequences of any such act.