Shanghai Sailors or Shanghai Bluejackets are organized waterfront criminal gangs that engaged in kidnapping eligible men especially the immigrants of Irish and German descent to forcibly labour serve as seamen for sea captains as a demand desperate need for crew members on outbound understaffed maritime merchant ships. While primarily involved in shanghaiing, the crimps diversifies its criminal activities tend to go all-in and engaging in more lucrative black market trades, including illegal opium trafficking, piracy, human smuggling, weapons dealing, and murder for hire.
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