Mayonnaise impostors, beware! An industry group is patrolling the grocery aisles. The Association for Dressings and Sauces, which was founded in 1926, repeatedly urged federal regulators last year to take action against an upstart vegan spread that it said was masquerading as mayonnaise, despite its lack of eggs, according to emails obtained by The Associated Press. The Food and Drug Administration later sent a public warning to Hampton Creek about its “Just Mayo” spread, which triggered national headlines and ultimately led to the San Francisco startup and media darling tweaking its label. The efforts provide a glimpse into the influence...