It is actually easier for the espioneur to transmit it than to get it, generally speaking, but it is difficult for him to do both jobs at once, so the spy ring's two major parts consist of the ones who get the information from the enemy and the ones who transmit it back to their employers.
"The Foreign Hand Tie"
Gordon Randall Garrett
So, they are willing to take these jobs, to be put out to pasture on wayward planets until they die at thirty-five.
"For Every Man A Reason"
Patrick Wilkins
You turn those jobs over to me.
"I Walked in Arden"
Jack Crawford