renegue
/ˈrɛnɪɡeɪd/Definitions
1. noun
a person who has deserted or defected from an organization, especially a military or political group, and often becomes an opponent.
“The former soldier became a renegade after he disagreed with the group’s new leadership.”
2. verb
to desert or defect from an organization, especially a military or political group.
“The politician’s advisors accused him of reneging on his campaign promises.”