Namely

I was watching the 1947 film Crossfire.  It's a film noir directed by Edward Dmytryk, and some consider it important since it deals with anti-Semitism.

It was highly regarded in its day, receiving five Academy Award nominations (though it didn't win any), including Best Picture.  I don't consider it a classic.  However, it is better than that film that won Best Picture--Gentleman's Agreement, which also takes on anti-Semitism.

There is one thing that distinguishes Crossfire, though.  It's the Robertest film ever made.

Look at the leads--Robert Young, Robert Mitchum and Robert Ryan.  I don't think there's ever been that many Roberts at the head of a cast.  In fact, I can't recall any movie where the three leads shared the same first name.  (Last name sure--any Marx Brothers film will do.)