One other thing about Manna - if you read Remo Franceschini's book he says that he didn't believe and had evidence that Manna didn't kill or plot to kill Irwin Schiff that it was someone else but Franceschini was from another department and the department that was handling the case didn't want to be bothered so they went with what they had. There's a lot of competition between different departments - Brooklyn vs. Manhattan, local vs. federal, etc. - so it's a logical point and even happens today in various cases.