salesman, an experience he drew on in his best-selling book, How to Win Friends and Influence People. In the early 1920s, Armour encountered financial troubles and the family sold its majority interest to financier Frederick H. Prince. The firm retained its position as one of the largest American firms through the Great Depression and the sharp increase in demand during World War II. During this period, it expanded its operations across the United States; at its peak, the company employed just under 50,000 people. In 1948, Armour, which had made soap for years as a byproduct of the meatpacking process, developed a deodorant soap by adding the germicidal agent AT-7 to soap. This limited body odor by reducing bacteria on the skin. The new soap was named Dial because of its 24-hour protection against the odor-causing bacteria. Armour introduced the soap with a full-page advertisement using scented ink in the Chicago Tribune. During the 1950s, Dial became the best-selling deodorant soap in the US. The company adopted the slogan "Aren't you glad you use Dial? Don't you wish everybody did?" in 1953. In the 1960s, the Dial brand was expanded to include deodorants and shaving creams. Because of the popularity and strong sales of Dial brand, fueled by magazine, radio, and television advertising, Armour's consumer-products business was incorporated as Armour-Dial, Inc. in 1967. In 1958, William Wood-Prince, a cousin of Frederick H. Prince, became president of Armour and Company. 1970–1985 In 1970, Armour and Company was acquired by Chicago-based bus company Greyhound Corporation after a hostile takeover attempt by General Host Corporation a year before. In 1971, Greyhound relocated Armour's headquarters from Chicago to Phoenix, Arizona, to a new $83-million building. Rock icon Stevie Nicks' father, Jess Nicks, who was a Greyhound executive, became president of Armour. In 1978, Greyhound sold Armour Pharmaceuticals to Revlon. Revlon sold its drug unit in 1985 to Rorer (later known as Rhône-Poulenc Rorer). Forest Laboratories acquired the rights to Armour Thyroid from Rhone-Poulenc Rorer in 1991. The remaining assets of Armour Pharmaceuticals are now part of CSL Behring. Armour's Factor VIII product "Factorate" was widely reported as infecting thousands of hemophiliacs worldwide with HIV during the 1980s; there have also been allegations that the firm suppressed evidence showing the product was defective. As a result, there have been lawsuits, inquiries and criminal charges. Greyhound's rapid diversification and frequent unit restructurings led to erratic profitability.