Stalin's cleansing of Soviet prisoners of war after World War II can be regarded as drawing lessons from historical experience to some extent. In my opinion, the purpose of doing this is to prevent the The Decemberists incident from happening again in the Soviet Union. 18 14, when czar Alexander I left Paris, he not only put out the fire of the French revolution, but also brought it back to Petersburg. Those noble officers followed the czar's army to put out the revolution, but they were infected by the revolutionary ideas in western Europe. As Tolstoy wrote in War and Peace, the ghost of revolution is hidden in the glory of victory. Russia exhausted its energy to cure the "French plague" in Europe. When the patient finally recovered, the virus had taken root in the doctor. The carriers of these "viruses" are officers who have seen the Enlightenment and revolutionary spirit in Western Europe. 1945, the situation faced by the Soviet Union was very similar to that of Russia in 18 14. After a long war, Russia once again became the savior of Europe, but it paid a greater price than the last time. The situation in Russia is quite similar to that of 100 years ago: it has the strongest army in Europe, but it still lags behind western Europe in other aspects, and the centralization and cruelty of state power are also the highest in Europe. Generally speaking, the Soviet Union still has not got rid of the image of "barbarian". In this case, it is natural for the Soviet Union to purge prisoners of war. In fact, after the war, Soviet prisoners of war rescued by western allies were subjected to the most severe scrutiny, while those rescued by Soviet troops on the eastern front were treated much better. These prisoners of war liberated by the west, seeing the development of the west and being rescued by the allied forces, are likely to have a good impression on the western countries. These people are likely to be brainwashed by western ideas, and they may become time bombs of the Soviet regime. 1825, Alexander I died suddenly, the throne was empty, and The Decemberists held activities in Petersburg. And once something happens one day, such as Stalin's death, it is difficult to guarantee that no one will take advantage when the Soviet Union is weak. The examination and cleaning of these prisoners of war is undoubtedly a preventive measure. The prisoners rescued on the Eastern Front were shocked to a certain extent because they left a historical stain, but they did not exceed the normal state of the Soviet Union.