cartelist

[ kahr-tel-ist ]
/ kɑrˈtɛl ɪst /

noun

a member of a cartel or an advocate of cartelization.

adjective

Also car·tel·is·tic [kahr-tl-is-tik, -te-lis-] /ˌkɑr tlˈɪs tɪk, -tɛˈlɪs-/. of, relating to, or characteristic of a cartel.
characterized by or advocating cartelization.

Origin of cartelist

First recorded in 1670–80; cartel + -ist