 Complete the following phrase:  In 1953 Dulles became the fifth DCI under President Eisenhower. John Foster Dulles, Dulles brother, was Eisenhowers Secretary of State. Under the DDP Helms was specifically tasked in the defense of the agency against the threatened attack by Senator Joseph McCarthy, and also in the development of truth serum and other mind control drugs per the CIAs controversial Project MKUltra. From Washington, Helms oversaw the Berlin Tunnel, the 19531954 espionage operation which later made newspaper headlines. Regarding CIA activity, Helms considered information obtained by espionage to be more beneficial in the long run than the more strategically risky work involved in covert operations, which could backfire politically. Under his superior and mentor the DDP Wisner, the CIA marshaled such covert operations, which resulted in regime change in Iran in 1953 and Guatemala in 1954 and interference in the Congo in 1960. During the crises in Suez and 