I googled the sentence; this is from an article about Alcatraz in the 1930s, right? The author means that the effects of both "headlines" (the 70-point headlines of newspapers of the day, blaring the news about bootleggers and organized crime) and "Hoover," who was the US President from 1929 to 1933, must both be considered when taking the decision (to transfer Kelly to Alcatraz). In his or her quest for alliteration, the author has sacrificed clarity.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.