Nouns

(n)cabal, faction, junto, camarillaa clique (often secret) that seeks power usually through intrigue
(n)conspiracy, cabala plot to carry out some harmful or illegal act (especially a political plot)

Verbs

(v)conspire, cabal, complot, conjure, machinateengage in plotting or enter into a conspiracy, swear together“They conspired to overthrow the government”