On June 25, 1948, the Berlin Airlift began:
When the Soviet Union began blockading the city, communists in Berlin began rioting:
The Soviets launched a massive propaganda campaign condemning Britain, the United States and France by radio, newspaper and loudspeaker. The Soviets conducted well-advertised military maneuvers just outside the city. Rumors of a potential occupation by Soviet troops spread quickly. German communists demonstrated, rioted and attacked pro-West German leaders when these attended meetings of the municipal government in the Soviet sector.
First came the occupation. Then the propaganda. Then the communists started rioting.