[...]then you know how ruthless and bloodthirsty they can be. The Blades are the worst of them all, I'm afraid. We're a humble, god fearing town that is only trying to survive, and these... these... monsters... prey on us... [He whispers under his breath] and our children...
Upon entering the L.A. ruins known as the Boneyard, a guard will suggest that the Vault Dweller do some work for Jon Zimmerman in order to be gain safe passage through the town. Jon is located in the southern area of Adytum and requests that the Vault Dweller kill Razor.
Razor is the leader of the Blades and is located north of Adytum. Upon executing Razor, the Blades become hostile. Fortunately for the Vault Dweller, the Blades are either unarmed or armed with weak melee weapons. Looting their corpses can provide a large number of stimpaks. Virtually every Blade has a little stash of caps, making this a relatively lucrative and easy mission.
The Vault Dweller then should return to Jon Zimmerman to receive their reward.
However, if when speaking to Razor, and selecting the dialogue options "Are you the leader of this gang?" and answer, "Zimmerman sent me." then "To pay you back for killing his son" then "Uh... Who are you going to send to hell?" she'll tell the Vault Dweller that it wasn't the Blades that killed his son, it was the Regulators who murdered him and framed the Blades. Razor then offers a recording of Regulator transmissions as proof. The Vault Dweller can then choose to tell Zimmerman about it, and Razor will give the Vault Dweller a holodisk. If the Vault Dweller shows the holodisk to Zimmerman, he will try to kill all of the Regulators.