I understand that their first female cosmonaut who went into orbit and died during re-entry:
People intercepted her last transmission and she was SCREAMING.
It was hushed up.
It’s my understanding that their very first attempt put too much thrust behind the cosmonaut and actually propelled him out of Earth orbit. It’s entirely possible that a dead cosmonaut may be farther outside our solar system than Voyager is.
More links to the old Soviet space Program from BBC Worldwide for those interested:
https://www.youtube.com/results?search_query=Soviet+space+program
The lunar lander's hatch was open and a bronze plaque bearing names and dates in Cyrillic had been thrown hastily onto the moon's surface.The Americans paused to express their admiration for the Russian pilot who must have known he was on a suicide mission.
Considering the Soviet space program, this plot wasn't so far-fetched.