It is second only to censorship. Censorship is not a tripwire, it is THE tripwire. Thus, by default, censorship morally justifies rebellion. Under censorship, no other rights, including the right to be free from censorship, can be advocated, discussed, or queried. It is incorrect to say that after censorship comes utter subjugation.
Censorship is utter subjugation.
There is no greater usurpation of liberty while remaining alive. After censorship come the death camps, and they are not a prerequisite of censorship, they are merely a symptom of it. Censorship qua censorship is sufficient in itself to justify open rebellion against any government that legislates, enforces, or upholds it. However, that is not the half of it. Censorship is alone in being the only violation of individual rights that does not require actual enforcement or challenges in court, before rebellion is justified.