Definition of "catnapper"

Besides, I reflected, Joe might easily have become a catnapper, as so many millions of other Americans had become since Sarah Perkins, during the campaign, had made it so widely known that although the incumbent President slept in a bed with the covers over him for three and sometimes four hours a night, she herself never slept at all except for the catnaps.

1965, The New Yorker, page 28

Mr. Harding was contacted by the catnappers, and arrangements were made for him to pay a ransom and recover the animal.

1999, Elane Osborn, The Cop and Calamity Jane, page 103