Green Gang
The Green Gang was often hired by Chiang Kai-shek's Kuomintang to break up union meetings and labor strikes and was also involved in the Chinese Civil War. One of the leaders of the Green Gang, Ying Guixin, was also involved in Yuan Shikai's assassination of the rival politician Song Jiaoren in 1913. Carrying the name of the "Society for Common Progress", it was — along with other criminal gangs — responsible for the White Terror massacre of approximately 5,000 pro-Communist strikers in Shanghai in April 1927, which was ordered by Nationalist leader Chiang Kai-shek. Chiang granted Du Yuesheng the rank of general in the National Revolutionary Army later.