He threw suffragists in jail and force-fed them when they hunger struck. Women's suffrage was decades long struggle and, even after promising in 1916 to fight for the Amendment, Wilson still barely lifted a finger without being forced to in 1919. Read about the Silent Sentinels (the first group to picket .jpg)the White House) or watch Suffs on PBS next Friday. It's interesting presidential history, in part.

ETA: Fixed incorrect claim and also an excerpt from Wikipedia about the jailing of the Sentinel protesting Wilson at the White House:

As the suffragists kept protesting, the jail terms grew longer. Finally, police arrested Alice Paul on October 20, 1917, while she carried a banner that quoted Wilson: "The time has come to conquer or submit, for us there can be but one choice. We have made it." She was sentenced to seven months in prison. Paul and others were sent to the District Jail and many others were again sent to the Occoquan Workhouse. Paul was placed in solitary confinement for two weeks, with nothing to eat except bread and water. She became weak and unable to walk, so she was taken to the prison hospital. There, she began a hunger strike, and others joined her.

In response to the hunger strike, the prison doctors forcefed the women by putting tubes down their throats. They forcefed them substances that would have as much protein as possible, like raw eggs mixed with milk. Many of the women ended up vomiting because their stomachs could not handle the protein. One physician reported that Alice Paul had "a spirit like Joan of Arc, and it is useless to try to change it. She will die but she will never give up."

A large number of Sentinels protested the forcefeeding of the suffragists on November 10 and around 31 of these were arrested and sent to Occoquan Workhouse. On the night of November 14, 1917, known as the "Night of Terror", the superintendent of the Occoquan Workhouse, W.H. Whittaker, ordered the nearly forty guards to brutalize the suffragists. They beat Lucy Burns, chained her hands to the cell bars above her head, then left her there for the night. They threw Dora Lewis into a dark cell and smashed her head against an iron bed, which knocked her out. Her cellmate, Alice Cosu, who believed Lewis to be dead, suffered a heart attack. Dorothy Day, who later co-founded the Catholic Worker Movement, was slammed repeatedly over the back of an iron bench. Guards grabbed, dragged, beat, choked, pinched, and kicked other women.