The Spies Who Owned Green Lantern! Taking out Betty Sloan to a dance club as a favor for Carol Ferris, Hal is hypnotized by Betty and commanded to type secrets about devices the Ferris Aircraft Company is making for the U.S. Military to mail to spies. After a few nights of typing up these letters, and fighting crime by day, an accidental fire at night prompts Hal's Power Ring to warn him of the danger, snapping him out of his hypnotic trance.
Realizing what he's done, Hal gets Pieface to help him out the following night. When after preparing a new letter of secrets and going to sleep for the night, Pieface would use Hal's power ring to will him down to a small enough size to be put in the envelope to be mailed to the spies.
When the spies received the envelope later that day, Hal would be awake and free of the hypnosis, and break free as Green Lantern, rounding them up and turning them over to the authorities.