 Stalin had a particularly strained relationship with Yugoslav leader Josip Broz Tito due to the latter's continued calls for Balkan federation and for Soviet aid for the communist forces in the ongoing Greek Civil War.In March 1948, Stalin launched an anti-Tito campaign, accusing the Yugoslav communists of adventurism and deviating from Marxist–Leninist doctrine.At the second Cominform conference, held in Bucharest in June 1948, East European communist leaders all denounced Tito's government, accusing them of being fascists and agents of Western capitalism.