Genocide is one of the horrible crimes against humanity. “Legal Times” US newspaper writes it in review of Samantha Power’s “A Problem from Hell: America and the Age of Genocide.” The author tells about events related to the Holocaust, the Armenian genocide committed in World War I, massacre of Cambodians and Iraqi Kurds. The book adduces serious arguments in favor of recognition of the fault of those countries, which had committed mass extermination of peoples in various periods of time.