For Throw Back Thursday, take a look at the 1986 O'Dwyer's PR Firm Rankings as Hill+Knowlton led the charge with just over $100M in billings. In a time before conglomerates swept in to acquire the largest agencies (and forbid them from submitting rankings data), Burson-Marsteller, Ogilvy, Ketchum, Fleishman-Hillard were among the top 10.

Today's reigning king, Edelman, now topping $700M, was at a modest $20.9M. (Here's this year's rankings list by comparison.)

PR firm rankings 1986