Tito's foreign policy sought to integrate Albania into the Yugoslav federation, support the Greek communist guerrillas, and broaden ties with Bulgaria–potentially uniting the countries. Conclusion of the 1947 Bled Agreement with Bulgaria, and imminent deployment of the Yugoslav Army to Albania prompted a political confrontation with the Soviet Union. The clash culminated with the Tito–Stalin split in 1948. For political reasons, the rift was presented as ideological rather than geopolitical one. In response, the KPJ purged real and perceived Soviet supporters and regime opponents. Tito understood that the Yugoslav government had to differ from the interwar centralism and Soviet-style socialism, therefore the KPJ gradually moved away from party centralism, introducing self-management. This led to debates about the level of (de)centralisation and a power-struggle which increasingly equated the struggle for centralism with unitarism and Serbian interests at the expense of other republics of Yugoslavia. The KPJ proclaimed shift of its role from a ruler to a leader, decentralised its structure, and rebranded itself as the League of Communists of Yugoslavia (SKJ) at its sixth congress in 1952.