In April 1977 Moscone stood up to officials in Washington by supporting 25-day occupation of San Francisco's Federal Building by a group of over 100 people with disabilities demanding their civil rights in what would become known as the 504 Sit-In. While federal officials hoped to starve out the protesters, the mayor visited them and arranged to have portable showers and towels brought in. Thanks in part to Moscone's support, the occupation was successful, and helped pave the way for passing the Americans with Disabilities Act (ADA) thirteen years later.