The Rockefeller Brothers Fund has left its mark on America. Founded in 1940 by five sons of John D. Rockefeller Jr.–John 3rd, Nelson, Laurance, Winthrop, and David–it has been a major supporter of New York’s Riverside Church (where the family worshipped), the Museum of Modern Art (which their mother co-founded), Colonial Williamsburg (where JDR 3rd and Winthrop chaired …