What are the major purposes in government according to classical republicanism?

You can do your own research on this, as there are quite a few sources:
Classical republicanism - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Classical_republicanism)
classic republicanism - Google Search (http://www.google.com/search?q=classic+republicanism&sourceid=ie7&rls=com.microsoft:en-US&ie=utf8&oe=utf8)