Espionage, subversion, infiltration, and sabotage are shown by an analysis of Soviet case material to be Soviet instruments of war. The author considers Soviet intelligence work in Germany in WWII to be a classic in espionage. He sees psychological warfare in all its aspects as a new usage of war. His fundamental position is that we must assess the Russian clandestine war potential, must be able to deal with it, and must ourselves be able to wage a war without battlefield.