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I just checked; it looks like my source on Higgins is an FBI file quoted in Anthony Summers' book on Hoover (which is a generally unreliable book, but in this specific passage it's a direct quote). Here's a bit on Higgins:

Marguerite Higgins

Higgins was sent to Vietnam in 1953 where she reported the defeat of the French Army at Dien Bein Phu. During the fighting she narrowly escaped injury when while walking alongside the photographer, Robert Capra, he was killed when he stepped on a land mine.

In 1955 she travelled extensively in the Soviet Union and afterwards published her book Red Plush and Black Bread (1955). This was followed by another book on journalism, News is a Singular Thing (1955). Higgins also covered the civil war in the Congo.

Higgins made many visits to Vietnam and her book Our Vietnam Nightmare (1965), documented her concerns about United States military involvement in the region.