Easy Pete used to be a prospector looking for working tech, chems and guns to sell. Pete mentions that he once hit a "...real good claim out east by the river" but then mentions how he got run off by raiders. He eventually got tired of the prospector life and decided to settle in Goodsprings, where he now watches over a herd of bighorners. He also occupies a house in Goodsprings where the Courier can take anything without negative Karma, as well as having the option to sleep on the bed since the bed isn't actually classified as being owned by Easy Pete.
"They're slavers, led by a guy named Caesar. Or Caesar. Not sure how you're supposed to say it. A couple of years ago they tried to take over Hoover Dam, but the NCR beat them back. The NCR didn't - or couldn't - finish the job, though. The Legion's got its strength back and is getting ready for another round at the Dam. My money's still on the NCR winning, but you never know. We've been hearing stories about Legionaries on the Nevada side of the river, so keep a gun handy. You don't want to get caught by them."