This sensible and timely study uses tools and insights from a variety of academic disciplines, including economics, and its approach has been shaped by the perspectives of systems analysis. An insurgent movement is viewed as a system of inputs and outputs directed by control mechanisms. Originally published 1970. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.