vice ring
noun [ C, + sing/pl verb ] uk/ˈvaɪs ˌrɪŋ/ us/ˈvaɪs ˌrɪŋ/
（尤指与性或毒品有关的）犯罪团伙
a group of people involved in immoral illegal activities, especially illegal sex or drugs
It's thought that the pornographic films are being distributed by an international vice ring. 据认为那些色情电影是由一个国际犯罪团伙分销出去的。