在俄羅斯,極端主義是政治對反對黨的標籤。 Extremism - definition of extremism by The Free Dictionary. The Free Dictionary. [2016-04-19]. (原始内容存档于2015-12-08). (英文) Definition of extremism by
and Lone Wolf Extremism - Extremism in America. [2010-09-18]. (原始内容存档于2010-08-04). Tom Metzger and White Aryan Resistance (WAR) - Extremism in America.
Exposures):資訊安全漏洞的資料庫 美國海軍對於護航航空母艦的代碼 Countering violent extremism, efforts by the U.S. government to counter violent extremism, particularly through media and communications