We discuss intelligence communities. They provide products for decision-makers in diplomacy and national security. So-called spy activities are just a part of them. United State intelligence community faced failures in 9/11 attacks in 2001 and Iraqi War in 2003. Their reforms have been discussed for a long time, but they saw another failure in U.S. withdrawal from Afghanistan in 2021. Intelligence activities are becoming increasingly important in Japanese diplomacy and national security.