After world war two what was the soviet attempt to control berlin by not allowing the allied countries to provide supplies to the city?

The Berlin Blockade (24 June 1948 - 12 May 1949.1) was one of the first major international crises of the Cold War. During the multinational occupation of post-World War II Germany, the Soviet Union blocked the Western Allies' railway, road, and canal access to the sectors of Berlin under Western control.