Technically, the government (FCC) can shut down the Amateur Radio Service at will simply by ordering the service to cease operation. This is why you have to be licensed, you are technically a government service. Of course, the "Service" was initially set up when threats were assumed to be foreign or natural disasters. I don't think a "Kommunist Presidential Koup" inflicted on the citizenry was in their mindset.
That being said, in a real emergency where the government was out of control and "in the wrong", if you have the equipment, it could be used despite the order. But they could jam communications, and transmitting too much from one location could get you located and shut down by force.
I would imagine, the safest communication would be to transmit from Canada or elsewhere with amateur receivers in the USA. Smuggle messages to the transmitter and everyone listening could hear if it wasn't being jammed.
>>I would imagine, the safest communication would be to transmit from Canada or elsewhere with amateur receivers in the USA. Smuggle messages to the transmitter and everyone listening could hear if it wasn’t being jammed.<<
You mean from Canada from Ham radio?
I’m really close to Windsor.