...en young men, thereby precipitating the nationwide anti-imperialist (and anti-British) May Thirtieth Movement (五卅运动), the force developed new riot control measures.
abstract:The May Thirtieth Movement () was a major labor and anti-imperialist movement during the middle-period of the Republic of China era. It began when Shanghai Municipal Police officers opened fire on Chinese protesters in Shanghai's International Settlement on May 30, 1925.