"Under the banner of Leninism (derived from Lenin) guided by communist party - [move] straightforward to the full victory of communism."

Dunno know how to translate idioms normally. Most of the soviet signs seems like language from 1983.

It may be power distribution frame (fuses on the top and the switches in the middle of photo) plus contol panel for a bunker machinery. As I see they(switches) quite new, at least mid-80s or early 90s

Maybe it something like "Room checked"? (And have no remains of bodies or something like(blue X) / Bodies are hidden quite well(pink X))