The papers consist of letters, notes, pamphlets, and miscellaneous papers. Weinberger did not act as an attorney for Tom Mooney, the labor organizer convicted and imprisoned for the San Francisco Preparedness Day bombing in 1916, but he did try to help secure a pardon for Mooney from the Governor of California. Weinberger was able to obtain a letter from one of the jurors in the Mooney trial requesting that Mooney be pardoned. One of Weinberger's clients, Alexander Berkman, was involved in the case. The San Francisco authorities tried to associate him with the Mooney case by charging him with murder. They failed in their attempt to extradite Berkman to California.