"The cause of anti-communism, which united millions of Americans and which gained the support of Democrats, Republicans, and independents, was undermined by Sen. Joe McCarthy.... McCarthy addressed a real problem: disloyal elements within the U.S. government. But his approach to this real problem was to cause untold grief to the country he claimed to love.... Worst of all, McCarthy besmirched the honorable cause of anti-communism."
The time period that the author refers to in the passage above is most likely the ______.