The "Prison Special" was a train tour organized by suffragists who, as members of the Silent Sentinels and other demonstrations, had been jailed for picketing the White House in support of passage of the federal women's suffrage amendment. In February 1919, 26 members of the National Woman's Party boarded a chartered train they dubbed the "Democracy Limited" in Washington, D.C. They visited cities across the country where they spoke to large crowds about their experiences as political prisoners at Occoquan Workhouse, and were typically dressed in their prison uniforms. The tour, which concluded in March 1919, helped create support for the ratification effort that ended with the adoption of the Nineteenth Amendment on August 26, 1920.

The Silent Sentinels, also known as the Sentinels of Liberty, were a group of over 2,000 women in favor of women's suffrage organized by Alice Paul and the National Woman's Party, who nonviolently protested in front of the White House during Woodrow Wilson's presidency starting on January 10, 1917. Nearly 500 were arrested, and 168 served jail time. They were the first group to picket the White House. Later, they also protested in Lafayette Square, not stopping until June 4, 1919 when the Nineteenth Amendment to the United States Constitution was passed both by the House of Representatives and the Senate.