The AAS Bylaws include an Article on non-discrimination in professional activities:

As a professional society, the AAS must provide an environment that encourages the free expression and exchange of scientific ideas. In pursuit of that environment, the AAS is committed to the philosophy of equality of opportunity and treatment for all members, regardless of gender, gender identity or expression, race, color, national or ethnic origin, religion or religious belief, age, marital status, sexual orientation, disabilities, veteran status, or any other reason not related to scientific merit. All functions of the Society must be conducted in a professional atmosphere in which all participants are treated with courtesy and respect. It is the responsibility of the chairperson of an AAS committee, of the organizers of any AAS meeting, and of the members themselves to ensure that such an atmosphere is maintained. Furthermore, the rich diversity of the Society's membership and of the astronomical community in general is a resource that should be drawn upon when selecting organizing committees, invited speakers, and nominees for office and for special prizes.

Consistent with this non-discrimination Bylaw, the AAS Council at its January 2008 meeting approved the following anti-harassment policy.