Inspired by HoI4.
So, could the NKVD get their own divisions a la SS? Maybe Stalin doesn't purge the army; instead he creates a new one under NKVD control that will eventually absorb the old one.
So, is it possible at all? Would Stalin trust so much power to Beria (who would have his own army)? And if he did, what effects would that have? Maybe Beria would be the one who succeeds Stalin? Or maybe Stalin goes with it but gives the NKVD to someone who he has more trust on?