Well, if you haven't heard yet, ATF blew off Rep. Issa's subpoena and declined to provide the requested documents. The 4 documents they did provide (and denied to Sen. Grassley) apparently had nothing to do with Fast and Furious.
Rep. Issa has asserted his authority under law to Acting Director Melson and informed him that the next act would be citations of contempt of Congress if they do not comply with the subpoena.
I'm really puzzled at ATF/DoJ's approach here. Either there is a big run on clownshoes at DoJ, or this is really, really, bad and the current horrible behavior is happening because as bad as it is, it is still better than complying.