Khrennikov and other functionaries of the Composers‘ Union constantly attacked the heritage of the Russian avant-garde as well as its researchers. For example, the German musicologist Detlef Gojowy (1934–2008) was persecuted because of his promotion in the West of modern Soviet music of the 1920s. Gojowy was proclaimed to be an "anti-Soviet writer" – till 1989 he was forbidden to visit the Soviet Union and some of his publications that he sent to Soviet colleagues were intercepted by Soviet customs. At the same time, Soviet musicologists engaged in developing a Russian avant-garde tradition were officially prohibited from going abroad. Once again, Nicolai Roslavets was an example.