Final answer:
McCarthy initiated investigations primarily targeting the Army, leading to widespread career damage, known as McCarthyism, culminating in his censure.
Explanation:
McCarthy started an investigation of the Army. He launched a series of televised hearings that led to many ruined careers through threats, innuendos, and blacklists, a period known as McCarthyism. McCarthy's actions were eventually condemned, leading to his official censure by the Senate for 'unbecoming conduct.'
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