The Collaboration: Hollywood's Pact with Hitler (Available in September 2013).
An excerpt from a description of the book (Source: Harvard University Press):
To continue doing business in Germany after Hitler’s ascent to power, Hollywood studios agreed not to make films that attacked the Nazis or condemned Germany’s persecution of Jews. Ben Urwand reveals this bargain for the first time—a “collaboration” (Zusammenarbeit) that drew in a cast of characters ranging from notorious German political leaders such as Goebbels to Hollywood icons such as Louis B. Mayer.Read a review of the book: "Hollywood’s Creepy Love Affair With Adolf Hitler, in Explosive New Detail."
Hollywood's Pact with Hitler.