Williams was an advocate of family planning and served on the executive committee of the local Birth Control League. The federal Comstock laws made it difficult at that time to be closely associated with any aspect of birth control. When Margaret Sanger, a national leader of the family planning movement, spoke at Temple B'rith Kodesh in 1932, she was arrested for answering a question from the audience about where birth control devices could be obtained. Williams preached a sermon on "The Spiritual Significance of Voluntary Motherhood" and invited Sanger to speak from the pulpit at First Unitarian a few weeks after she was arrested. A group of eight women, including Wilma Lord Perkins from First Unitarian, subsequently formed an organization that eventually became Planned Parenthood of Rochester/Syracuse. When the organization found it difficult to obtain office space elsewhere, First Unitarian provided them space in Gannett House from 1934 to 1937.