The outspoken abolitionist senator Charles Sumner,
after delivering
a speech on the senate floor, was accosted by the Southerner
Preston Brooks, who, outraged by Sumner’s words, bludgeoned the
senator with a gutta-percha cane, which Brooks was
able to do with
impunity, due to a tradition holding that the laws of the United
States did not obtain on the senate floor.