Nancy Pelosi was secretly briefed on torture many, many years ago, and yet did nothing to stop those unlawful programs. Indeed, she egged the torturers on.
Pelosi also hid from the 9/11 Commission and the American people the fact that the interrogations of 9/11 suspects were videotaped, and that the alleged "confessions" of those held at Gitmo were wholly unreliable. She could have stopped the whole farce cold -- but chose to go along with it.
Even covering up a crime committed by someone else is itself a crime: