Liberty Defined: 50 Essential Issues That Affect Our Freedom is a best-selling 2011 non-fiction book by Congressman Ron Paul (R-TX).The book came out on April 19, 2011. On release, it was fifth on Amazon's best-selling non-fiction books and nineteenth for all books. For the week ending April 29, 2011, it was fourth on the Wall Street Journal's Best-Seller List.