That's a pretty loaded question. First we need to establish that the US government is ignoring Constitutional warrant requirements, then we need to separately establish if it's ignoring Habeas Corpus. We need to specify how and to whom these apply and if the US is applying them improperly. Then we need to determine the volume, scale and scope of these violations(if they are determined to exist). Only AFTER we've done that, can we go over to history and see if they are comparable to what the USSR did. And even if they were, we've got some pretty important disclaimers to cover first.
Further, and the reason I mentioned "history" above, is because personal perception of what's going on is not the same, nor even truly a valid measure, of what IS actually happening. I mean just because a half a dozen guys think the government is overstepping it's bounds and becoming like the USSR, does not actually mean that's happening.