50 years ago, the USSR launched the first manned space station, Salyut 1.
https://en.wikipedia.org/wiki/Salyut_1As the above links shows, it had a very difficult start, with one abortive docking then the first actual crew to work in a station on the next launch, were killed by a defect in their Soyuz 11 spacecraft on their return.
Scott Manley breaks it down,
https://www.youtube.com/watch?v=Ju6rmFm1_9MFurther to NASA Astronaut Tom Stafford being at the funeral of the crew, Apollo 15's crew, the next manned NASA after this tragic loss had their own tribute included, with the Salyut 11 crew added presumably late as the accident happened weeks before Apollo 15.
https://en.wikipedia.org/wiki/Fallen_AstronautHowever the real legacy, as Scott points out, is the basic design of Salyut today endures in early modules for ISS and now, the recent Chinese station that has launched.