What is a faction? Why are majority factions more dangerous than minority factions, according to James Madison?

Answer 1

http://www.google.com/webhp?source=search_app#q=faction+definition

http://jared.realizingresonance.com/2011/07/14/james-madison-and-the-problem-of-factions

http://en.wikipedia.org/wiki/Federalist_No._10