 On 30 May 1925, a bloody massacre took place in Shanghai, known as May Thirtieth Movement (五卅運動 Wǔsà- yùndòng).About 2000 Shanghai workers and students ushered in a vigorous anti-imperialist movement, protesting imperialist domination and demanding to abolish the unfair treaties.The demonstrators thundered "Down with the imperialists!