Hillary Clinton Did It. By the Wall Street Journal Editorial Board.

The Russia-Trump collusion narrative of 2016 and beyond was a dirty trick for the ages, and now we know it came from the top — candidate Hillary Rodham Clinton.

That was the testimony Friday by 2016 Clinton campaign manager Robby Mook in federal court, and while this news is hardly a surprise, it’s still bracing to find her fingerprints on the political weapon. …

In short, the Clinton campaign created the Trump-Alfa allegation, fed it to a credulous press that failed to confirm the allegations but ran with them anyway, then promoted the story as if it was legitimate news. The campaign also delivered the claims to the FBI, giving journalists another excuse to portray the accusations as serious and perhaps true.

Most of the press will ignore this news, but the Russia-Trump narrative that Mrs. Clinton sanctioned did enormous harm to the country. It disgraced the FBI, humiliated the press, and sent the country on a three-year investigation to nowhere. Vladimir Putin never came close to doing as much disinformation damage.

hat-tip Stephen Neil