Any books in the Law Library on this period share the same shelfmark as post-revolutionary Russia: namely USSR on Floor 1.
SOLO searches may also reveal useful items in the Taylor Slavonic Collection and the History Faculty Libraries.
The Law Bod has a separate collection with shelf marks beginning USSR for this period of Russian legal history. It is on Level 1.
Add the search term Soviet Union to SOLO subject searches to find other works: a considerable proportion will be in Russian only.