A record 396,000 people were deported from the U.S. this past federal fiscal year through raids and arrests. Though Immigration and Customs Enforcement is not shy about its success, it has been found to be deporting U.S. citizens in the process.
Source: http://www.npr.org/2011/10/24/141500145/in-the-rush-to-deport-expelling-u-s-citizens?ft=1&f=1014
Pat Roberts Barbara Mikulski John McCain Jay Rockefeller Thad Cochran Tom Harkin Harry Reid Patrick Leahy