renegade
ren-e-gade
adjective
Having abandoned a group or cause; disloyal or rebellious.
"The renegade faction refused to follow orders."
noun
A person who abandons a group, cause, or set of principles.
"He was branded a renegade for leaving the party."
Thesaurus
Synonyms: disloyal, recreant, turncoat, apostate, deserter, ratter, rebel