According to World Heritage Encyclopedia, in the Sverdlovsk air disaster of 5 January 1950 almost the entire national ice hockey team (VVS Moscow) died, which was covered up by Vasily Stalin (born Dzhugashvili):
According to a recent news article, Stalin's son Vasily Dzhugashvili, an Air Force commander of the Moscow Military District and the patron of the ice hockey team, was afraid of his father's possible reaction and of the crash investigation
This blog adds incredible details:
families had no information what happened that day. Corpses were as mutilated as hard to identify, so gov’t service buried them in a mass grave near crash site. It was known that Joseph Stalin had no knowledge about the crash and further Vasily’s roster moves. And it was some horror-like expansion draft. VVS had still two days to play game at Chelyabinsk, so to avoid people’s or Stalin Sr.’s suspicions Vasily completed the team with… players who have the same last names as deceased ones. Also, he ordered the press to publish Moscow team line combinations or scorers only with last names, unless scorers are Bobrov, Vinogradov, Shuvalov. Yuriy Zhiburtovich was replaced by his brother Pavel, and in the press he was just Zhiburtovich with no first name. Alexander Moiseev was replaced by non-related player with the same last name. The other players were also replaced by new players, but each time when some of them scored, official press didn’t mention his name and credited a goal to notable players. The Moscow team won 8:3 and returned to the capital city. At the end of season VVS was fourth in team standings, but due to Vasily’s rebuilding offensive they have won next three championships.
However, I can't find a better source. I reckon that someone who could google in Russian would be able to confirm it.
