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In page Caroline Spencer (suffragist):

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Between 1917 and 1919, Spencer was one of many women who became known as the Silent Sentinel, as they stood in front of the White House and carried pickets and banners for their cause. Although it was not illegal to picket, after the U.S. entered the war in 1917, Alice Paul was warned by police that arrests would be made if the women continued.[citation needed] Caroline Spencer was arrested on three occasions and subsequently imprisoned twice.[3][2]