The wartime alliance with the United Kingdom and the United States was continued in the post-war years. Although pursuing the goal of a socialist economy, the Labour Party distanced itself from the Communists, especially after the Communists' seizure of power in Czechoslovakia in 1948, and strengthened its foreign policy and defence policy ties with the US. Norway received Marshall Plan aid from the United States starting in 1947, joined the Organisation for Economic Co-operation and Development (OECD) one year later, and became a founding member of the North Atlantic Treaty Organization (NATO) in 1949.