Blackbeard, Jose Gaspar, Jean Lafitte--the names conjure up a romantic, swashbuckling figure with a black patch over one eye, a cutlass in his teeth, and a brace of pistols tucked into his waistband. Actors such as Errol Flynn did much to create that devil-may-care attitude glamorized on the silver screen, but in fact, real pirates were not so admirable; for the most part they were cruel, greedy, dastardly brigands, many of whom were slave traders...