Practicing Law Without A License
Practicing Law Without A License means one is infringing upon the territory staked out by lawyers - namely interfering with their right to make money off the legal woes of the public. Lawyers closely guard this revenue source by making damn sure they control the safety nets.

In almost every state, Practicing Law Without A License covers more that just pretending to be a lawyer. While you have the right to represent yourself in court you do not have the right to help your neighbor prepare a defense for his day in court, regardless of how mundane the charges or situation.

"The first thing we do," said the character in Shakespeare's Henry VI, is "kill all the lawyers." It is a start.