One of the things I've heard about Jehovah's Witnesses is that they've been persecuted by governments for their pacifism:
They do not work in industries associated with the military, do not serve in the armed services, and refuse national military service, which in some countries may result in their arrest and imprisonment. They do not salute or pledge allegiance to flags or sing national anthems or patriotic songs. Jehovah's Witnesses see themselves as a worldwide brotherhood that transcends national boundaries and ethnic loyalties. Sociologist Ronald Lawson has suggested the religion's intellectual and organizational isolation, coupled with the intense indoctrination of adherents, rigid internal discipline and considerable persecution, has contributed to the consistency of its sense of urgency in its apocalyptic message.
And from Persecution of Jehovah's Witnesses in the United States
Throughout the history of Jehovah's Witnesses, their beliefs, doctrines 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 religion 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 at times led to persecution of Jehovah's Witnesses in various countries, including the United States.
Is their pacifism based on a rejection of all violence, or is it more a reflection of their beliefs about, and behaviour regarding governments?