Offering the first comparative-historical study of mass atrocities against religious minorities in Muslim societies, Tezcür focuses on two case studies--the Islamic State's genocidal attacks against the Yezidis in northern Iraq in the 2010s and massacres of Alevis in Turkey in the 1970s and 1990s--while also addressing discrimination and violence against followers of the Bahá'í faith in Iran and Ahmadis in Pakistan and Indonesia. Analyzing a variety of original sources, including interviews with survivors and court documents, Tezcür reveals how religious stigmatization and political resentment motivate ordinary people to participate in mass atrocities.