Zub is a man who was the target of an operation that Jake Peralta and Charles Boyle worked on.
Throughout The Series[]
In the cold open for the Season Three episode Into the Woods, Jake Peralta and Charles Boyle are a part of a raid on Zub's criminal organization. When Jake wants to know why his delivery of "Hey there, sorry for dropping in" was only pretty cool and not cool Zub tells him about the fudge on his cheek.