What does Zigzag tell Stanley when Stanley wonders how the Warden knows their names?

Zigzag explains to Stanley that the Warden has a way of knowing everything about the boys at the camp, including their names. He implies that the Warden has a network of information and surveillance that keeps her informed. Zigzag's response reflects the oppressive atmosphere of Camp Green Lake, where the boys feel constantly monitored and controlled. This adds to the sense of fear and uncertainty they experience in the camp.