Booted

 is a quest in Fallout: New Vegas.

Quick walkthrough
You will find Boxcars in General Store in Nipton, who tells you about the slaves taken by the legion. You must head East until you find the legion camp. Then kill all legion soldiers there and untie the two slaves to complete the mission.

Detailed walkthrough
During your visit in Nipton you notice that something isn't right. Upon entering, a very strange man who seems to be over-excited about winning "The Lottery" runs into you and keeps repeating that he has won. When you go further into the town, the Legion have taken over the town and killed almost everyone. While searching through the the town, you find a man called Boxcars in the general store.

Boxcars thinks you're going to kill him. His legs are crippled by the Legion and tells you about the lottery that the legion plays with the town of Nipton. The mayor of Nipton had the lottery ticket to be burned in a pile of tires. Boxcars was lucky that he was alive but they smashed his legs, and he is now a cripple. He explains to you that some of the Powder Gang were enslaved by the legion and headed east. He mentions that his legs are very painful and needs Med X. You then have the option to spare some for him (You get a choice of up to five doses).

You head east towards the quest marker. You may come across some legion about to get into a fight with some NCR troopers, You can help either side(will lead to infamy) or another random encounter. Continue on and you will run into a couple more legion soldiers on the way. You eventually get to the Enslaved Powder Gang members at the Legion Raid Camp. You do not need to kill all the Legion soldiers there, if you are neutral to the legion, you can just untie the slaves, completing the quest. (There is no Negative Karma for killing the slaves after the quest is completed). Note that freeing the Powder Ganger slaves will result in a positive increase in rep with them with no effect on your reputation with the legion, unless you kill them of course.

Alternatively, If you see no faction standing at all in your Pip-Boy 3000 with the Legion(Stats/General), then they may turn hostile once a Powder Ganger is untied.

The captives may also be set free by carefully choosing a moment when the guards turn away, this will not lead to any complications with the Legion. This can most easily be done at night when there are few Legion wandering around, and there's just the two guards watching the Powder Gangers. If you untie them while the Legion are looking out away from the campfire, they will not turn hostile. This can be influenced by speaking to a Legionnaire from the opposite side (with you facing towards the campfire). They will remain looking out into the wasteland for a few seconds before resuming their periodic turning.