This article focus to Define and Discuss on McCarthyism Practice. The term McCarthyism defined a period of U.S.A. history in the 1950s when there seemed to be intense concern about Communist infiltration of American society. It took its name from Oughout. S. Senator Joseph McCarthy, Republican from Wisconsin, who had been involved in accusing many individuals of being Communist or maybe having Communist sympathies. These individuals were then often subjected to aggressive investigations, questioning through congressional committees.