▁brother ▁John ▁F oster ▁D ul les ▁was ▁Eisen h ower ' s ▁Secretary ▁of ▁State . ▁Under ▁the ▁D DP ▁Hel ms ▁was ▁specifically ▁task ed ▁in ▁the ▁defense ▁of ▁the ▁ag ency ▁against ▁the ▁threatened ▁attack ▁by ▁Senator ▁Joseph ▁Mc Car thy , ▁and ▁also ▁in ▁the ▁development ▁of ▁" tr uth ▁ser um " ▁and ▁other ▁" mind ▁control " ▁dru gs ▁per ▁the ▁C IA ' s ▁controvers ial ▁Project ▁M K U lt ra . ▁From ▁Washington , ▁Hel ms ▁o vers aw ▁the ▁Berlin ▁T unnel , ▁the ▁ 1 9 5 3 – 1 9 5 4 ▁esp ion age ▁operation ▁which ▁later ▁made ▁newspaper ▁head lines . ▁Regarding ▁C IA ▁activity , ▁Hel ms ▁considered ▁information ▁obtained ▁by ▁esp ion age ▁to ▁be ▁more ▁benef icial ▁in ▁the ▁long ▁run ▁than ▁the ▁more ▁strateg ically ▁ris ky ▁work ▁involved ▁in ▁cover t ▁operations , ▁which ▁could ▁back fire ▁polit ically . ▁Under ▁his ▁superior ▁and ▁ment or ▁the ▁D DP ▁Wis ner , ▁the ▁C IA ▁mar sh aled ▁such ▁cover t ▁operations , ▁which ▁resulted ▁in ▁regime ▁change ▁in ▁Iran ▁in ▁ 1 9 5 3 ▁and ▁Gu atem ala ▁in ▁ 1 9 5 4 ▁and ▁inter ference ▁in ▁the ▁Congo ▁in ▁ 1 9 6 0 . ▁During ▁the ▁cr ises ▁in ▁S uez ▁and ▁Hung ary ▁in ▁ 1 9 5 6 ▁the ▁D DP ▁Wis ner ▁became ▁dist ra ug ht ▁by ▁what ▁he ▁saw ▁as ▁the ▁dis loy alty