The Silent Sentinels, also known as the Sentinels of Liberty, were an American 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.
The Sentinels started their protest after a meeting with the president on January 9, 1917, during which he told the women to "concert public opinion on behalf of women's suffrage." The protesters served as a constant reminder to Wilson of his lack of support for suffrage. At first the picketers were tolerated, but they were later arrested on charges of obstructing traffic.