AskHistorians, 
Illuminate the shadows of #History with /u/hellcatfighter and this fantastic #ThrowbackThursday post on secret societies in #China, and one particular one known as the Green Gang. A prominent group that emerged in the Republican period. @histodons
https://www.reddit.com/r/AskHistorians/comments/inq5tq/what_role_did_the_chinese_triads_have_in_the/g4chuz2/