Despite sporadic media coverage of extraditions and recent cases of expulsions of foreign nationals from Mexico to the United States, little is known about broader patterns and implications of these practices: What is the difference between extraditions and expulsions? What are the most common charges? Are some organized crime groups targeted more frequently than others? Do some U.S. districts request more extraditions than others? How long does it take to extradite someone from Mexico after their indictment in the U.S.? How often do extradited individuals take plea deals? These are only some questions that motivated our research project. In this working paper we share preliminary results of our analysis, which provides a first systematic look into Mexico-U.S. extraditions and expulsions.