McCarthyism
phenomenon in the United States of making accusations of subversion or treason without proper regard for evidence, named after Senator Joseph McCarthy

McCarthyism is a political practice defined by the accusation and investigation of left-wing individuals of communist and Soviet influence on American institutions and of Soviet espionage in the United States during the late 1940s through the 1950s, heavily associated with the McCarthy era. After the mid-1950s, U.S. senator Joseph McCarthy, who had spearheaded the campaign, gradually lost his public popularity after several of his accusations were found to be false. The U.S. Supreme Court under Chief Justice Earl Warren made a series of rulings on civil and political rights that overturned several key laws and legislative directives, and helped bring an end to the Second Red Scare.
Historians have suggested since the 1980s that as McCarthy's involvement was less central than that of others, a different and more accurate term should be used instead that more accurately conveys the breadth of the phenomenon, and that the term McCarthyism is, in the modern day, outdated. Ellen Schrecker has suggested that Hooverism, after Federal Bureau of Investigation (FBI) head J. Edgar Hoover, is more appropriate. Following the end of the Cold War, documents revealed Soviet spy activity in the United States, although many of the agents were never properly identified by McCarthy.
Origins
President Harry S. Truman's Executive Order 9835 of March 21, 1947, required that all federal civil-service employees be screened for "loyalty". The order said that one basis for determining disloyalty would be a finding of "membership in, affiliation with or sympathetic association" with any organization determined by the attorney general to be "totalitarian, fascist, communist or subversive" or advocating or approving the forceful denial of constitutional rights to other persons or seeking "to alter the form of Government of the United States by unconstitutional means".
What became known as the McCarthy era began before McCarthy's rise to national fame. Following the breakdown of the wartime east–west alliance with the Soviet Union, and with many remembering the First Red Scare, President Harry S. Truman signed an executive order in 1947 to screen federal employees for possible association with organizations deemed "totalitarian, fascist, communist, or subversive", or advocating "to alter the form of Government of the United States by unconstitutional means." The following year, the Czechoslovak coup by the Communist Party of Czechoslovakia heightened concern in the West about Communist parties seizing power and the possibility of subversion.
This brief starts where responsible research should: with the source description of “McCarthyism” as phenomenon in the United States of making accusations of subversion or treason without proper regard for evidence, named after Senator Joseph McCarthy. Everything that follows is an evidence route, not borrowed authority.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 23, 2026. The linked authority identifier is Q207066. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1947.
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