The Hamburg uprising came to an end in arrests of hundreds of Communists. Many more fled the city. The end was precipitated by news that Hamburg, due to a courier error, was in a working class revolution all by itself. The Communist Party, realizing what had occured, ordered its red troops to retreat.
Germany was in dire straights at the time, and a nationwide Communist revolution was not an impossibility, although the Moscow ordered uprising would likely have resulted in a civil war which the Red Army could not have joined due to Poland having defeated it earlier in the decade.
The collapse of the Communist uprising may have spared Germany from a thuggish totalitarian regime for almost a decade, as there's no reason to believe that the German Communists would have been any less bloody in victory than the Russian, Chinese, etc., ones were.
