Strikes Law enforcement 9 Pickets 6 Defense industry 5 Employment 5 Demonstrations 4 Electrical apparatus industry 4 more ... Tear gas 4 Violence 4 Boat & ship industry 3 Clothing trade 3 Fighting 3 Judicial proceedings 3 Labor unions 3 Student movements 3 Women 3 African Americans 2 Aircraft industry 2 Arbitration, Industrial 2 Ash disposal 2 Food industry 2 Hosiery 2 Hotels & taverns 2 Industrial buildings 2 Local transit 2 Newspaper industry 2 Parades & processions 2 Police 2 Riot control 2 Sabotage 2 Steel industry 2 Vigilance committees 2 Wands & injuries 2 World War, 1939-1945 2 Agricultural laborers 1 Autogiros 1 Automobile driving 1 Automobile industry 1 Baking 1 Barrooms 1 less ...