Treason. Attempt to overthrow government.
Conspiracy to overthrow the government through force.
Setting aside that element, I really wish people like this would be confronted with how the numbers aren’t exactly in their favor. Not just in terms of population demographics but also geography. Their “revolution” just can’t spread very far beyond the urban population centers, most of those killed will be their own people or allies (Liberal urban hipsters) and they can be contained and subjected to seige/starvation tactics.
For example,Iirc, all of NYC’s water flows in through two big pipes (with a third being built). Turn the valves off somewhere Upstate and watch how fast the “revolution” crumbles.
Which is the same as demanding gun control.
Already done.