> This is also how the Soviet Union--which ostensibly had free speech and assembly--operated.
It didn't though. Or the same way China has freedom of speech. You disappear if you say things the regime doesn't like.
It's also codified in the RSFSR Penal Code. 58-10 seems pretty explicit by itself:
58-10. Anti-Soviet and counter-revolutionary propaganda and agitation: at least 6 months of imprisonment.
The parallel with the U.S. system even if far from being perfect is disingenuous.