From a joint staff report on Gunwalker

Link to full report here:
"The Department’s leadership allowed the ATF to implement this flawed strategy, fully aware of what was taking place on the ground. The U.S. Attorney’s Office for the District of Arizona encouraged and supported every single facet of Fast and Furious. Main Justice was involved in providing support and approving various aspects of the Operation, including wiretap applications that would necessarily include painstakingly detailed descriptions of what ATF knew about the straw buyers it was monitoring."

And never forget that DoJ flatly lied to Congress:
Agent describes a supervisor: "Whenever he would get a trace report back . . . he was jovial, if not, not giddy, but just delighted about that, hey, 20 of our guns were recovered with 350 pounds of dope in Mexico last night. And it was exciting." Supervisors saying, if want an omelette, you have to break some eggs.

A DoJ letter: "At the outset, the allegation described in your January 27 letter – that ATF “sanctioned” or otherwise knowingly allowed the sale of assault weapons to a straw purchaser who then transported them into Mexico – is false." Another: "It remains our understanding that ATF’s Operation Fast and Furious did not knowingly permit straw buyers to take guns into Mexico."
A flat, no bullshit lie, put on paper and signed off on by DoJ.