It's not exactly propaganda, for instance both Popov and Marconi invented radio independently the same year. I guess nobody had radios to tell them about each others work faster.
Technically Popov published his work a few months before Marconi. Popov published in December 1895, while Marconi filed for a patent in June 1896.
{{citation needed}}
This is quite shoddy and misleading work, but it does confirm your priors. For one specific example, while Sakharov is called "the father of the Soviet hydrogen bomb", I can't possibly believe the Soviets taught that they invented the atomic bomb before the Americans (who used it as an ally of the Soviets in WWII).
Not an expert, but now you have a list of 20 names. You can search all 20 together or a subset and see what turns up.
GPT type systems are well known for hallucinating reasonable sounding but factually incorrect data.
You need to do your due diligence, for example, the first computer mouse by all rights wasn't invented until the 60s, whereas Vladimir Shukhov died in 1939.