The Philadelphia Society, founded in 1964, is a membership organization the purpose of which is to "to sponsor the interchange of ideas through discussion and writing, in the interest of deepening the intellectual foundation of a free and ordered society, and of broadening the understanding of its basic principles and traditions". The membership of the Society tends to be composed of persons holding conservative or libertarian political views, and many of those associated with the Society have exercised considerable influence over the development of the conservative movement in the United States.