Security Service Workers' Day is observed in the Russian Federation, the Republic of Belarus, the Republic of Armenia, and the Kyrgyz Republic every December 20. This professional day has its origins in the Soviet Union, where it was initially known as Chekist Day, celebrating the anniversary of the Cheka, the first state security organization. The Cheka later evolved into various agencies, including the NKVD, OGPU, and KGB, which became the national security services in post-Soviet countries. Celebrations are typically organized at the state level, with officials attending solemn events and award ceremonies honoring distinguished employees in the capitals of these countries.