Final answer:
Reynaldo is commanded by Polonius to spy on Laertes in order to gather information about his behavior and acquaintances.
Step-by-step explanation:
Reynaldo is commanded by Polonius to spy on Polonius's son, Laertes. Polonius instructs Reynaldo to travel to Paris, where Laertes currently resides, and gather information about his son's behavior and acquaintances. Polonius wants Reynaldo to subtly question people who know Laertes and observe his actions to determine if he is engaging in any questionable behavior.