Buenos Aires was still half asleep one morning last week when the military men who run the country made a crucial political move. From hot, muggy Martin Garcia Island in the River Plate 30 miles north of the capital, a military transport buzzed aloft carrying ousted President Arturo Frondizi, his daughter, his private secretary and 2½ tons of Frondizi's belongings, mostly books. A few hours later Frondizi alighted at San Carlos de Bariloche, a summer fishing and winter ski resort in the Argentine Andes, 850 miles southwest of Buenos Aires.
Nearly a...