After the war, he became a journalist, working for the London Observer, in Greece, North Africa, and South Asia, from 1946 to 1961.
[1] After his release he wrote the book I was a Captive in Korea and returned to his career in journalism.
[3] During the 1970s he was speech writer and top aide to Canadian Prime Minister Pierre Trudeau.
[5] In 1980 he ran for MP in the Canadian riding of Broadview-Greenwood, but was defeated by Bob Rae.
In his book Nice Work: The Continuing Scandal of Canada's Senate, journalist and author Claire Hoy wrote that Gigantes, during a filibuster in the Senate, read one of his books into the record; another senator suggested that he did this to get the work translated into French for free by parliamentary staff responsible for Hansard.