How can we account for our present situation unless we believe that men high in this government are concerting to deliver us to disaster? This must be the product of a great conspiracy, a conspiracy on a scale so immense as to dwarf any previous such venture in the history of man. A conspiracy of infamy so black that when it is finally exposed, its principals shall forever be deserving of the maledictions of all.

Joseph McCarthy (1908-1957) American politician, attorney

“America’s Retreat from Victory: The Story of Gen. George C. Marshall,” speech, US Senate (14 Jun 1951)
    (Source)

Part of a 65,000 word speech given by McCarthy, attacking Sec. of Defense George C. Marshall (and, by proxy, Harry Truman), alleging a string of sinister post-WW2 US diplomatic and military failures, culminating in Truman's firing of Douglas MacArthur.