Other than his brutal bullying of witnesses, what brought down Senator Joseph McCarthy in 1954?

Senator Joseph McCarthy's reign of terror started to come to an end when he accused members of the United States Army of being communist. This unfolded in front of the American public's eyes, as the Army-McCarthy hearings were shown on national TV. The antics and lack of proof provided by McCarthy discredited his claims. Ultimately, he is now remembered as an individual who spread fear without having valid evidence to support his fears.