The Wire to Twin Peaks
4 connections
The Wire
Homicide: Life On The Street
On The Wire (episode "That's Got His Own") Junior Bunk from Homicide was mentioned as someone who had once put bad drug product on the market causing deaths.
The X-Files
Homicide's John Munch questioned The X-Files' The Lone Gunmen.
Fringe
Fringe makes reference to The X-Files classification of files.
Twin Peaks
Fringe's Walter is friends with Dr. Jacoby from Twin Peaks