For example, amid the Hiss–Chambers and Coplon spy cases and the investigation of David E. Lilienthal's management of the U.S. Atomic Energy Commission, Krock observed: The persons whose names have entered the trials and investigations, fairly and unfairly, include none who was affiliated with the Republican party ...

The ideal solution from the standpoint of these strategists [President Truman's] would be: (1) the acquittal of Hiss ... (2) a find by the Joint Congressional Committee on Atomic Energy that Lilienthal has been a good manager ... (3) repudiation by public opinion of the more sensational testimony before the third Un-American Committee; (4) at least one substantial trial victory for the Department of Justice.

Historian David Nasaw wrote that the journalist seemed to be all but in the pocket of the powerful millionaire (whose second son would become U.S. president while two others would contend for the office).

In October 1963, less than two months before the assassination of Joe Kennedy's son, President John F. Kennedy, Krock wrote a column headlined "The Intra-Administration War in Vietnam" in which he quoted a high-ranking government official: The CIA's growth was 'likened to a malignancy' which the 'very high official was not even sure the White House could control ... any longer.'

[7] He was married twice, first to Marguerite Polleys, daughter of a Minneapolis railroad official, from 1911 to her death following a long illness in 1938.

[8] In 1939, he wed Martha Granger Blair of Chicago, a divorced society columnist for the Washington Times-Herald, who had two sons.