April 21 (UPI) -- The Southern Poverty Law Center announced via YouTube Tuesday that it is now the target of an investigation by the Department of Justice. "Although we don't know all the details, the focus appears to be on the SPLC's prior use of paid confidential informants to gather credible intelligence on extremely violent groups," said CEO Bryan Fair in the video . "This use of informants was necessary because we are no stranger to threats of violence. In 1983, our offices were firebombed,