The Oath Keepers are an American far-right and anti-government militia organization. They are made of military, police and first responders. They pledge to fulfill an oath that all military and police take in order to "defend the Consitution against all enemies, foreign and domestic". It encourages its members to go against orders which would violate the United States Constitution. The Anti-Defamation League (ADL) has estimated the group's membership at several thousand.