In 1959, Childs Traveled back in to the Soviet Union to attend a meeting of all heads of state of communist nations. Serving as the U.S. delegate, he was elected recording secretary and was thereby privy to top secret documents. One night while filing away some of these documents in his safe, he slammed the door on his little finger, cutting the tip of it off. Fearful that under sedation he might reveal that he was working on behalf of the FBI, he refused an anesthetic and had the doctors stitch him up. The next day, Premier Khrushchev acknowledged the incident, boasting that Morris was so committed that he refused the anesthetic because he was so protective of the Soviet documents that he would endure the great pain rather than possibly betray the state secrets. Khrushchev called Childs to the podium before a crowded assembly and affectionately announced him to the "the last of the true Bolsheviks." This solidified his role as a highly trusted member of Khrushchev's inner circle and legitimized his position within the Kremlin. Because of the heights within which Childs had ascended within the Soviet power-base, Operation Solo was one of the most protected secrets within the Department of Justice. Only 12 people knew of Childs role and of the operation. In fact, not a single President of the United States knew about it until Gerald Ford was in office.

Married Eva Lieb in 1962 and revealed his role as an agent of the FBI. Eva participated in the clandestine activities as well as providing moral support to Morris who often found himself under overwhelming stress. Morris Traveled back to Moscow in November 1963 and was visiting with Ponomarov when news arrived of the assassination of President John Kennedy. Childs, who understood Russian fluently (a fact that he kept from the Soviets) listened in to a conversation between Ponomarov and a KGB official. From this Childs learned that the Soviet Union had nothing to do with the assassination. While in Moscow, Childs would bring home sensitive files which he and Eva would copy in the dark of night. Eva then smuggled these copies inside her blouse back to the United States.