Krenshaw is Ashur's right-hand man and is in charge of maintaining the peace, or as close to a violent suppression of Pitt slaves and trogs as he can manage without culling too many of the worker population. He also maintains the floodlight generators in Uptown; plunging this area into darkness would spell doom, as the trogs would overrun Haven.
Krenshaw has growing concerns that the slaves plan to revolt and is also worried that the auto axes they manufactured will be used in their plan to overthrow the Pitt raiders. He seems to question Ashur's actions and leadership, and subsequently his loyalty is a concern. His attitude towards his leader is seen in action upon entrance in Haven, although he does win Ashur's promise to address the situation.
Free Labor: Krenshaw can be heard arguing with Ashur when you take the elevator up to Haven, and leaves when Ashur promises to handle the situation. Krenshaw doesn't like that Ashur is holding an audience when the city is in danger, but reluctantly follows orders. Should you choose to steal Marie, Krenshaw will be the first raider outside to start firing at you.