must use a relay service. The victim, possibly drawn in by sympathy for a disabled caller, might be more susceptible to the fraud. FCC regulations and confidentiality laws require operators to relay calls verbatim and adhere to a strict code of confidentiality and ethics. Thus, no relay operator may judge the legality and legitimacy of a relay call and must relay it without interference. This means the relay operator may not warn victims, even when they suspect the call is a scam. MCI said about one percent of their IP Relay calls in 2004 were scams. Tracking phone-based relay services is relatively easy, so scammers tend to prefer Internet Protocol-based relay services such as IP Relay. In a common strategy, they bind their overseas IP address to a router or server located on US soil, allowing them to use US-based relay service providers without interference. TRS is sometimes used to relay credit card information to make a fraudulent purchase with a stolen credit card. In many cases however, it is simply a means for the con artist to further lure the victim into the scam. Invitation to visit the country Sometimes, victims are invited to a country to meet government officials, an associate of the scammer, or the scammer themselves. Some victims who travel are instead held for ransom. Scammers may tell a victim that they do not need a visa or that the scammers will provide one. If the victim does this, the scammers have the power to extort money from the victim. Sometimes victims are ransomed, kidnapped, or murdered. According to a 1995 U.S. State Department report, over fifteen persons were murdered between 1992 and 1995 in Nigeria after following through on advance-fee frauds. In 1999 Norwegian millionaire Kjetil Moe was lured to South Africa by scammers and was murdered. George Makronalli was lured to South Africa and was killed in 2004. Variants There are many variations on the most common stories, and also many variations on the way the scam works. Some of the more commonly seen variants involve employment scams, lottery scams, online sales and rentals, and romance scams. Many scams involve online sales, such as those advertised on websites such as Craigslist and eBay, or property rental. This article cannot list every known and future type of advanced fee fraud or 419 scheme; only some major types are described. Additional examples may be available in