Cosa Nostra was how the wiseguys referred to their organization. "La" shouldn't have been included. Hoover just jumped at a name that was different from the mafia, so he could act as if he was investigating them all along.

I have no idea if this is accurate or not....but in the Last Testament of LL, Charlie referred to his organization as the Outfit, same as in Chicago. I don't know if that came from Charlie or if it was something Gosch made up.

Finally, has it been discussed on this site if the story of attorney Roy Cohn having incriminating shots of Hoover in drag is true? Personally, I believe it.