go rogue

verb3

1. •
   To begin to behave in an erratic, uncontrolled, dangerous, destructive, or savage way.
2. •
   To behave in a very unconventional, independent, uncontrolled, or unauthorized way that ignores rules, norms, or expectations.

   • As the Biden administration and its allies try to secure an elusive cease-fire in Gaza, Israel appears to have gone rogue. — 2024
3. •
   To defect, or to repudiate allegiance, fealty, affiliation, or membership. (For example, a spy or soldier in relation to a country; or a politician in relation to a political party; or an employee; or a club member.)