Besides carrying the biggest stick in baseball, Mickey Charles Mantle, 29, speaks with a soft-selling voice in the world of advertising. A switch-hitter, Mantle has personally endorsed a clutch of products ranging from Camel cigarettes to an anti-smoking pill called Bantron, now leads both leagues in the amount of money he collects from testimonial ads—a sum so large that his business agent prudently will not divulge it.
Last week, stepping in to umpire Mantle's off-diamond performance, the Federal Trade Commission coldly advised the Yankee slugger to stop endorsing one product he admittedly...