"The OED cites an 1811 reference to a "pig" as a Bow Street Runner--the early police force, named after the location of their headquarters, before Sir Robert Peel and the Metropolitan Police Force (see above.) Before that, the term "pig" had been used as early as the mid-1500s to refer to a person who is heartily disliked.". . 2nd link shows the Cleveland Police Seal, looking suspicously porcine...