Sam Spade is a fictional Human character in detective novels by Dashiell Hammett.
Zak Kebron read Sam Spade stories during his Starfleet Academy off-time. (NF novel: Stone and Anvil)
Odo read fiction featuring Spade. (DS9 eBook: I, The Constable)
Other characters in this genre include Nate Heller, Philip Marlowe, and Dixon Hill.