After he ordered the military to use force to crack down on street protests in October 2003, causing many deaths, then-president of Bolivia Gonzalez Sanchez de Lozada fled the country with his cronies and has been comfortably ensconced in Miami ever since. Human rights organizations and the Bolivian government have been trying to get him extradited to give testimony and possibly be tried, but the U.S. is not cooperating so far.
Now there's an online petition you can sign, asking the U.S. to serve the subpoena.