Pada tahun 1920an, organisasi kriminal Kelompok Hijau (青帮) berhasil menguatkan kedudukannya di Shanghai. Selain menguasai dunia underworld (perjudian, prostitusi, dan pengedaran candu), Kelompok Hijau juga turun langsung dalam pemerintahan di kota Shanghai. Du Yuesheng (杜月笙), pemimpin Kelompok Hijau, sangat berperan dalam kesuksesan Kelompok Hijau kala tersebut. Kota Shanghai pada saat itu terbagi dalam tiga daerah pemerintahan utama, yaitu distrik Nanshi (Guomindang), konsensi Perancis, dan Pemukiman Internasional (Inggris). Tiga otroitas itu pun mengakui peranan Du Yuesheng. Awal kenaikan Du Yuesheng di Kelompok Hijau, hubungan serta peranannya dalam Pemerintahan Kota Shanghai di ketiga otoritas yang menguasai Shanghai, hingga berakhirnya pemerintahan kota Shanghai sehubungan dengan Agresi Militer Jepang tahun 1937 dibahas secara mendalam di tugas akhir ini.

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In the 1920s, a criminal organization called Green Gang (青帮) succeed to strengthen its position in Shanghai. Aside from controlling the underworld (such as gambling, prostitution, and opium traffic), Green Gang also took part in Shanghai city government. Du Yuesheng (杜月笙), the leader of Green Gang, play a big role in the success of Green Gang at that period of time. At that point, Shanghai city government was divided into three governmental area, which are Nanshi District (ruled by Guomindang), French Concession, and Shanghai International Settlements (British). The rise of Du Yuesheng in Green Gang, his relationship as well as his role in Shanghai city government, up to the end of Shanghai city government as the military aggression by Japan happened in 1937 would be discussed deeply in this thesis.