US National Archives
Nara: Treasures of Congress: Struggles Over Slavery the "Gag" Rule
This National Archives and Records Administration site contains John Quincy Adams' response to the "gag" rule in the House of Representatives, May 25, 1836, which restricted discussion about slavery in Congress . Also included are images...
US Senate
Historical Minutes: Gag Rule: March 16, 1836
A look at how the Senate in 1836 imposed a gag rule on petitions that advocated the abolition of slavery. Information is from "Arguing about Slavery" by William Lee Miller.