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Those same anti-fascist civil servants who fervently worked to root out US-Nazi WWII cooperation would later be targeted and destroyed by the House Unamerican Activities Committee (HUAC).
In 1952, Bobby Kennedy worked as an assistant counsel to US Senator Joseph McCarthy (R-WI) and for years his brother US Senator John F. Kennedy (D-MA) refused to publicly denounce this red baiting witchfinder-general from Wisconsin, something Eleanor Roosevelet had demanded of JFK for years in order to receive her endorsement of him as a POTUS candidate.
Hence, we learn the real purpose of the HUAC and the true message behind President Eisenhower's 17 Jan 1961 warning about the military-industrial complex in his farewell speech, as well as his personal animus against the Kennedy clan. This also helps to explain why in early 1961 JFK turned to retired five-star US Army General Douglas MacArthur for advice on containing communism. JFK would not heed the advice of the "American Caesar" and would blunder with the infamous April 1961 Bay of Pigs CIA invasion of Cuba fiasco, followed on by LBJ's unqualified support for the brutal Catholic minority junta ruling South Vietnam. This in turn would lead the Democratic Party's disastrous loss to Richard Nixon on Tuesday 5 Nov 1968.
This was the real so-called "Domino effect" of fighting communism during the Cold War.