This is the revised version of The Hymn of the Soviet Union. The original version was written in 1927 and had allusions to Josef Stalin. After Stain died in 1953 and Nikita Khruschev took over, Stalin was discredited. This created a problem with having Stalin's name mentioned in the national anthem. The solution? Keep the tune but ditch the words. Thus, The Hymn of the Soviet Union was officially wordless until 1977 when these new Stalin-free lyrics were adopted. There's a really interesting story about how the new lyrics came to be. If anyone is curious enough to ask, I'll post the story in the comments section.