But speaking of "angels", I'd say SAVAK was angelic compared to CIA, MI6, MOSSAD & KGB and their record of "brutality".
p.s. Regrettably you likely do not speak Farsi, but this BBC Persian show brings together a former SAVAK, National Front, and Fadeyeen Khalgh (militant terrorist Left) gentlemen including the historian who wrote a quite interesting book on Sabeti (SAVAK thinking end) and it is interesting how at the end of episode 2 they all wonder at how they agree that the poor "evil" "fascist" "puppet" Shah's regime was far far more civilized and gentle than the actual thugs of the so called Islamic Republic of Iran.