After the onset of the Cold War Truman oversaw the Berlin Airlift and Marshall Plan in 1948. When North Korea invaded South Korea in 1950, he gained United Nations approval to intervene in what became known as the Korean War. On domestic issues, bills endorsed by Truman faced opposition from a conservative Congress, but his administration successfully guided the U.S. economy through the post-war economic challenges. When he left office, Truman's presidency was criticized, though critical reassessment of his tenure has been favorable. Every single one of the strikers and their demagogue leaders have been living in luxury ... Now I want you who are my comrades in arms ... to come with me and eliminate the Lewises, the Whitneys, the Johnstons, the Communist Bridges [all important union officials] and the Russian Senators and Representatives ... Let's put transportation and production back to work, hang a few traitors and make our own country safe for democracy.