Informed the FBI that Stanley Levison had been a financial advisor for the Communist Party of the United States in 1954. Although Levison dropped out of the party a few years later, `FBI Director J. Edgar Hoover became alarmed because Levison had become an advisor of civil rights leader Martin Luther King, Jr. in the 1960's. Hoover, infatuated with King, sought to paint King as a communist working under the guidance of Levison. When the FBI informed King of Levison's past, King refused to disassociate himself from his advisor. This resulted in Hoover bugging King's home and hotel rooms. Hoover attempted to blackmail King with evidence of alleged adulterous affairs, an activity which caused horrific negative fallout upon the Bureau.

In January 1967, Childs made his 22nd trip to the Soviet Union on behalf of the FBI, he was confronted by Ponomarov with information obtained by a Soviet spy who had come across an FBI file which documented some of the information from Operation Solo, information that only Childs should have been privy to. Childs, in grave danger, bluffed his way out claiming that there must have been a leak in the Communist Party USA.

Childs, because of his position in the Communist Party also met with communist dignitaries around the world, including Chairman Mao Tse-tung of China. He learned that the Soviet Union and China were not friendly allies, despite their communist beliefs. He reported this divide, allowing the United States to develop a relationship with China during the Richard Nixon presidency.