Colin Kaepernick put together a pretty decent collection about Police/Prison Abolition. I wrote a review for Against the Current arguing that the book is weak on class analysis, and explaining why I think that is a problem. I should stress, though, that it represents practically a unique contribution to the abolitionist literature, in that it is extremely accessible and seems to be designed for study groups.
Order the book from Haymarket Press, and start a study group today!