The original 13th Amendment was secretly removed during the US Civil War. It was discovered in 1983 by David Dodge and Tom Dunn in a Belfast Library on the coast of Maine. They uncovered the United States Constitution printed in 1825, which was to prohibit lawyers from serving in government.
Since this Amendment was never officially removed from US law, it is stil on the books, and still in effect. How many Congressmen or Senators do you know who came from careers as lawyers?
Read all about it here.