Curriculum theory has long acknowledged the presence of a hidden curriculum in schools. Whereas the formal curriculum is explicit and documented, the hidden curriculum involves those attitudes, experiences, and learnings that are largely implicit and unintended. This article compares the hidden civic lessons found in public and private schools. Catholic and other private schools have measurable organizational strengths that socialize students into participation in public institutions more effectively than public schools. (Contains 5 figures and 2 tables.)