William de Grey served as Attorney General under William Pitt the Elder from 1766-1771. In 1770, he took part in the trial of Henry Sampson Woodfall for printing and publishing the Letters of Junius, which he claimed contained seditious libel. Woodfall went free on the declaration of a mistrial. John Miller, printer of the London Evening Post was declared not guilty. Only bookseller John Almon was declared guilty, though he appears not to have been punished.