'Guilty by Suspicion' is an interesting picture. I like it!
It does a great job at portraying the threat throughout, the FBI & Co. feel as omnipresent as intended. I particularly enjoyed the final few scenes, they absolutely nailed the chaoticness of the courtroom! Robert De Niro puts in a great showing, spearheading a decent supporting cast which includes Martin Scorsese. It's the first time I've seen him act barring minor cameos; well, aside from, eh, 'Shark Tale', I guess ...
All in all, glad I watched it and I would recommend it.