Throughout the history of Jehovah's Witnesses, their beliefs, doctrines, policies and practices have engendered controversy and opposition from governments, communities, and religious groups. Many Christian denominations consider their doctrines to be heretical, and some religious leaders have labeled Jehovah's Witnesses a cult. Members of the denomination have also met with objection from governments for refusing to serve in the military, particularly in times of war. Many individuals consider their door-to-door preaching to be intrusive. These issues have led to persecution of Jehovah's Witnesses in various countries, including the United States.