In the conditions of the Cold War and interruption of official diplomatic contacts between the USSR and Western countries, the mechanisms of paradiplomacy are activated. Friendship Societies and Cultural Ties with foreign countries are an important mechanism for the development of international humanitarian cooperation in the late Soviet period. The key areas of activity of Friendship Societies were cultural, educational, sports, scientific contacts, international tourism. The effectiveness of the Friendship Societies is evidenced by the creation of a significant network of regional and city branches, including tens of thousands of primary organizations. The paper examines the activities of the Sverdlovsk branch of the Society of Soviet-Czechoslovak Friendship from the moment of its creation to the termination of its activities. The annual increase in the number of collective members of the Society of Soviet-Czechoslovak Friendship testifies to the success and relevance of the organization. The studied materials of archives, museums, personal memories of the participants of the events allow us to conclude that the activity was voluntary, but financial, organizational, etc. support of party bodies played an important role.