Those were the interesting days. Another Nucleonics article, in July 1950, says this about the other South American powerhouse:
Why the “report in” command? Presumably because the president was in the process of obliterating the fraudulent nuclear fusion efforts of Ronald Richter (pictured below, on the left, with Peron on the right, the standard Wikipedia image) that so embarrassed the nation. There must be something fascinating in this tale but I just find it tawdry and only accord it a brief mention in my book.