Dina Wohlhendler isn't a very common name. So when the Brooklyn resident saw her name on another shopper's credit card at a Manhattan Best Buy, she chased the woman while shouting for help. Chase had already alerted Wohlhendler about an unauthorized purchase at Urban Outfitters, which led her to check the nearby electronics store. Surveillance tapes showed the suspect pickpocketed Wohlhendler's credit card before a fast, fraudulent shopping spree. Cases like Wohlhendler's remain rare, according to author and security expert Chris McGoey. "Some people don't even know for a while that their credit card has been stolen," McGoey tells CardRatings.com. Despite banks' best efforts, McGoey says that credit card fraud represents one of today's biggest consumer threats. Here are six things you should be doing to protect your financial identity.