title: How can I remove ALL of someone's contributions to a project using git?
body: <p>I am a contributor to a very old project presently in the process of relicensing. There are only about 30 contributors to the project, but it's almost ten years old at this point; Many of these people have moved on and I'm not sure I can find them all. </p>
  
  <p>The project is presently using git for version control, and git has the full history from the CVS before.</p>
  
  <p>In the event that I can't contact someone, we have to remove ALL of their work, and everything derived from that work. Is there a way to cause git to remove all of a person's commits, and any commit that touched the lines inserted by that person?</p>