From the National Archives and Records Administration collection:

Full caption reads as follows: Washington crowd mobs the White House Pickets. An indignant crowd of real Americans almost did serious damage to the women suffrage pickets in front of the White House, on July 14, 1917. Although the mob started a riot the police subdued them and arrested the suffragists before they could be harmed. In all sixten women pickets were arrested. Six more suffragists were arrested on August 18, 1917, and upon their refusal to pay $10 fine were sent to Occoquan workhouse.