KIN,
a Thief: He's one of the Kin, let him pike; said of a Brother Rogue whom one of the Gang knows to be a Villain, tho' not one of their own Crew.
· 
· 
Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
· ·
The Vulgar Tongue originally collected by Grose, 1811.
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).