It's a mystery to me as to who killed the assasins, confused but I am convinced that Fredo was not involved in the "hit." I believe he didn't know that an attempt was going to be made on Michael's life.

"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK

"War is over, if you want it" - John Lennon