When Joseph McCarthy accused people how did they prove their innocence?

During the McCarthy era, individuals accused of communist sympathies often found it challenging to prove their innocence due to the nature of the accusations, which relied heavily on fear and suspicion rather than concrete evidence. Many attempted to defend themselves by providing alibis, showing loyalty to the U.S., or disassociating from alleged communists. Some sought legal recourse, while others provided testimonies in front of congressional hearings, hoping to clear their names. However, the atmosphere of paranoia made it difficult for many to fully vindicate themselves, leading to significant reputational and professional damage.