Short Answer 
The Senate committee’s investigation found Joseph McCarthy’s claims of communist infiltration in the U.S. government to be unfounded, leading to a decline in his power and influence. McCarthy’s aggressive tactics during the Red Scare were scrutinized, ultimately resulting in his sidelining in American politics due to a lack of credible evidence.
Investigation Findings
The Senate committee conducted a thorough investigation into the claims made by Joseph McCarthy about communists infiltrating the U.S. government. They ultimately concluded that McCarthy’s allegations were completely unfounded, indicating that there was no basis for his accusations. This marked a significant moment where the credibility of such claims was critically examined.
McCarthy’s Role
Joseph McCarthy was a Republican Senator known for his aggressive stance against alleged communist influences within the Federal Government. His accusations led to widespread fear and suspicion, contributing to the atmosphere of the Red Scare. However, despite his intense campaigning and claims, he failed to substantiate these allegations with credible evidence.
Consequences and Loss of Power
Following the Senate committee’s findings, McCarthy faced increased scrutiny and restrictions from the Congress. The lack of evidence to support his claims led to a significant decline in his influence within the party. As a result, he lost much of his power and was ultimately sidelined, marking a dramatic fall from grace in American politics.