(Original Caption) Chicago, Illinois: U. S. Booze Prosecutor. Mrs. Mabel Walker Willibrandt, an assistant attorney general of the US in the offices of attorney general Daughtery at Washington. She is in charge of that section of the attorney general's office which supervise prosecution of liquor cases. Mrs. Willibrandt is the only woman assistant attorney general and her long suit is work. She is seen here in the Federal Building at Chicago where she arrived yesterday.