https://www.nationalreview.com/2019/05/william-barr-vs-eric-holder-a-tale-of-two-attorneys-general/
The differences between the cases are informative.
Speaker of the House Nancy Pelosi has declared it a “constitutional crisis” that Attorney General William Barr refuses to divulge the small parts of the Mueller report that contain grand-jury material. By a straight party-line vote, the House Judiciary Committee voted to hold Barr in contempt of Congress.
What did Pelosi think when Barr’s predecessor, Eric Holder, refused to divulge documents to a congressional committee and was held in contempt? “Ridiculous!” she said. What did Holder and Obama say? That the House subpoena was a violation of “separation of powers.”
To partisans, the difference between the cases is obvious. Barr is defending Trump; Holder was Obama’s self-proclaimed “wing man.” That is enough for many journalists and most politicians. The rest of us might want to know: What is the legal or constitutional difference between Holder’s refusal to provide documents and Barr’s?
Here is the background of the Holder contempt. The Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE), a unit of Holder’s Department of Justice (DOJ), conducted an operation called “Fast & Furious,” intended to track illegal gun sales. In fact it put hundreds of weapons in the hands of Mexican criminal gangs, leading to the death of an American officer. On February 2, 2011, after news of the operation emerged, Holder’s assistant attorney general sent a letter to Congress declaring that the Obama administration had no knowledge of the operation. This letter was false, as Holder later admitted.
A congressional committee wanted to know why it had been misled. BATFE employees leaked to Congress that the department was still suppressing the truth about the operation and retaliating against whistleblowers. The committee wanted to dig into that. It demanded DOJ documents “relating to actions the Department took to silence or retaliate against Fast and Furious whistleblowers,” so that it could determine “what the Department knew about Fast and Furious, including when and how it discovered its February 4 letter was false, and the Department’s efforts to conceal that information from Congress and the public.”
The committee’s first request for documents came early in March of 2011. The department did not comply with the request. On March 31, the committee issued its first subpoena. Again the department failed to comply. Over the next six months, the committee held a series of hearings, and Holder eventually admitted that the Fast & Furious operation had been “fundamentally flawed” and that DOJ’s February 4 letter denying administration knowledge was “inaccurate.” DOJ released thousands of pages of documents, but refused to give Congress all the documents it was asking for.