Final answer:
McCarthyism refers to the practice of making accusations of disloyalty without evidence, originated from the anti-Communist hysteria and techniques used by Senator Joseph McCarthy in the postwar period.
Step-by-step explanation:
McCarthyism, in its broadest sense, now means the practice of making accusations of disloyalty, especially in instances unsupported by proof. This term originated from the anti-Communist hysteria of the postwar period and the techniques used by Wisconsin senator Joseph McCarthy. McCarthy repeatedly issued accusations of disloyalty against numerous individuals and government agencies without providing any evidence.