As I opened the second volume of Stalin’s Collected Works, which I bought from a second hand bookshop in Kansas (!), a slip of paper fell out with the following notice:

This material is filed with the Department of Justice where the required statement, under the Foreign Agents Registration Act, of Four Continent Book Corporation, 156 Fifth Avenue, New York 10, N.Y., as an agent of Mezhdunarodnaja Kniga, Moscow, USSR, is available for public inspection. Registration does not indicate approval or disapproval of this material by the United States Government.

What a lovely piece of Cold War doublespeak, from somewhere in the 1950s. Nice to know that they checked the collection.