This collection consists largely of Crane's correspondence with public officials and conservative organizations, who, like Crane, actively opposed Franklin D. Roosevelt's New Deal and the activist state that emerged from the Second World War. Crane was prominently associated with the National Association of Manufacturers, the Foundation for Economic Education, the American School for Economics, and the National Council of the Churches of Christ. Crane was a board member of the latter organization, and his papers include Board of Directors minutes, budgets, and correspondence that documents the organization's role in the anti-communist crusade of the early 1950s. There is also substantial correspondence with officials of Princeton University that describes Crane's donations to the school and his concerns about federal funding for some of its programs.

Crane's conservative philosophy is also developed in correspondence with Rose Wilder Lane (1887-1968), editor of the National Economic Council's Review of Books. Their correspondence was edited by Roger Lea MacBride as The Lady and the Tycoon: the Best of Letters between Rose Wilder Lane and Jasper Crane (Caldwell, Idaho, 1973). The original correspondence between them is now in the Institute for Humane Studies at Menlo Park, California, but copies of many of Crane's letters are included in his files.