In fact, the communist-revolutionary, domestic terrorist, Weather Underground openly bragged about bombing the US Capitol AND the Pentagon!
"VVAW-supported demonstration during the Washington Spring Offensive,
April - May 1971. Notice the North Vietnamese and VietCong flags."
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In 1954, a group of Puerto Rican [Marxist] separatists got onto the House floor and opened fire with handguns. Five members of the House were wounded in the attack, including Rep. Alvin Bentley (Mich.). He's in the photo below, being carried out by pages.
SPJNK.