I heard one of the many worst things Stalin did during WW2 was that he essentially put a bunch of prisoners into suicide squads and used them as meat shields as a means to get rid of them.

by Tobiah497

   So how true is this? Also what are some of the other worst things that the USSR has done in general?

Galhaar

What you seem to be talking about are the penal divisions and blocking detachments that were especially prominent in the movie Enemy at the Gates.

This thread has an amazingly detailed answer by u/Georgy_K_Zhukov about the phenomenon I think you're talking about.