Since you mention it:
In 1954, members of the Puerto Rican Nationalist Party shot 5 Congressmen during an immigration debate on the floor of the United States House of Representatives.
Jimmy Carter commuted their lifetime prison sentences in 1979. (1/8)
Clinton pardoned men who bombed U.S. Senate.
In 1971 the Weather Underground detonated a bomb in a bathroom below the US Senate to protest American military operations in Laos.
Nobody was ever arrested for this act. Bill Ayers, one of the ringleaders, went on to become a close friend and mentor to Barack Obama.
Biden pardoned the J6 Committee First... meaning what they did was criminal... so...