SMERSH organs are the most classified organ of the Great Patriotic War. Military counterintelligence was supposed to be in a special regime of secrecy. We still do not know dozens of names of SMERSH heroes. It was not customary to write about the operations that they carried out in newspapers, some of them are only now becoming known to historians. But during the Great Patriotic War, Soviet military counterintelligence officers managed to bring the slogan "Death to spies" to life, destroying or neutralizing almost all the enemy's agents. The famous intelligence historian - Alexander Sever - talks in detail about this structure. How SMERSH worked and fought.