 He soon became a Postal Inspector himself, and served in that role until 1919, when he was appointed Chief of the Treasury Department's Internal Revenue Service Intelligence Unit.On July 1, 1919, the Commissioner of Internal Revenue, Daniel C. Roper created the Intelligence Unit to investigate widespread allegations of tax fraud.To establish the Intelligence Unit, six United States Post Office Inspectors were transferred to the Bureau of Internal Revenue to become the first special agents in charge of the organization that would one day become Criminal Investigation.