There are archival collections, usually from the papers of individuals (such as doctors or researchers) or organizations, available online. Below represents a few of these collections:
(Vol. 4, issue 28, 1970)
In the 1960s, the Black Panther Party created Community Survival Programs, providing services such as free breakfasts, health classes, and more. The Young Lords, a Puerto Rican and Latino movement out of Chicago, did similar work in city neighborhoods. Below is a selected, but not comprehensive, list of resources. You can find more through this guide from Christopher Newport University.
Yale has a wealth of interesting collections. If you want to look at the papers of individuals or groups discussing healthcare in cities, use Orbis or the Archives at Yale for detailed lists of these collections. You would have to see these collections on campus at Manuscripts and Archives or the Medical Historical Library, depending on who owns the collection, although some portions might be digitized.
Great materials open for research at Manuscripts and Archives and the Medical Historical Library include: