In (Season 7, Episode 18), Roy Cain (No. 150) is the warden of Wallens Ridge State Prison who operates a criminal side-business by hiring out inmates for contract crimes.
The "paper" you are likely referring to is , a critical document recovered at the end of the episode. The Importance of Cain's Ledger [S7E18] Roy Cain
: Cain inherited this illegal enterprise from a long line of prison administrators, dating back to his great-great-grandfather at the Louisiana State Penitentiary. In (Season 7, Episode 18), Roy Cain (No
: The investigation into Cain's activities leads the Task Force to find Dembe Zuma and Imam Sadiq Asmal , who had been abducted by Cain's men on behalf of Katarina Rostova. Character Profile: Roy Cain The Importance of Cain's Ledger : Cain inherited
: After Reddington confronts and kills Cain, Agent Alina Park recovers the ledger from his home. This allows the FBI Task Force to identify and arrest the various criminals and organizations that had employed Cain's "extraction" teams.
: He would place inmates with specific military or technical skills into solitary confinement, officially marking them as "in isolation" while actually sending them out to perform abductions and assassinations. Portrayal : The character is played by guest star Tom Wopat . Roy Cain (Character) - The Blacklist Wiki
: The ledger contains a detailed record of the inmates Roy Cain used for his "side business" and, more importantly, the clients who paid for their services.