I found the paragraph on page 13 of Sarah Palin's new book, Going Rogue.
After his adventures in Tombstone, the legendary lawman Wyatt Earp came north and spent a few years in Nome during the gold rush. On the other side of the law was "Soapy" Smith, a Wild West crime boss whose tight-knit gang moved from Colorado to Skagway. They made a mint cheating gold miners out of their cash. It finally caught up with Soapy Smith: he was killed in a shoot-out with a vigilante gang.