Ambassadors of the Working ClassIn 1946 Juan Pern launched a populist challenge to the United States, recruiting an army of labor activists to serve as worker attachs at every Argentine embassy. By 1955, over five hundred would serve, representing the largest presence of blue collar workers in the foreign service of any country in history. A meatpacking union leader taught striking workers in Chicago about rising salaries under Pern. A railroad motorist joined the revolution in