The book shows the class essence and social base of nationalism in an exploitative society, traces the political collapse of nationalist organizations in Belarus during the years of Soviet power. The authors - scientists and journalists - expose the attempts of the special services of the West and bourgeois propaganda to revive nationalism in the USSR, talk about the detrimental effect this subversive activity has on the fate of people. The connection between nationalism and clericalism is revealed. A separate chapter is devoted to Zionism.