renegade

noun
  1. A person who deserts and betrays an organization, country, or set of principles. noun
    The soldier was branded a renegade after he defected to the enemy.
    She was considered a renegade for abandoning the political party she once supported.
  2. Having treacherously changed allegiance. adjective
    The renegade faction of the party broke away to form their own group.
    His renegade actions led to his expulsion from the organization.
  3. To become a renegade; to desert or betray an organization, country, or set of principles. verb
    He renegaded from the cause he once passionately supported.
    After years of loyalty, she renegaded and joined the opposition.