Former Attorney General Eric Holder not only used an email alias to conduct formal agency business, but appropriated the birth name of one of his idols, NBA legend Kareem Abdul-Jabbar, according to the Department of Justice
http://www.foxnews.com/politics/2016/02/26/eric-holder-aka-lew-alcindor.html
To file a FOIA request you need the name of the person, gee why would the AG use an AKA?