Letter From Henry Murphy to U.S. Attorney Slack Re Attempts to Cover Up

In this undated letter, Henry C. Murphy, owner of The Courier Newspaper, informed U.S. Attorney L. Ert Slack, the lead prosecutor of the whiskey conspiracy case, that a cover-up had begun and that Police Chief Edgar Schmitt and Mayor Benjamin Bosse had called Van Pickerill (here referred to only as "P") and tried some "tactics."

Why is this letter attributed to Henry C. Murphy? It is similar in nature and style to this letter, which identifies Murphy by the typed initials "HCM" and refers to his newspaper colleague, Percy Carroll.