It is about prison abolition; it also inherits the notion of abolition from W. E. B. Du Bois who wrote about the abolition of slavery. He pointed out the end of slavery per se was not going to solve the myriad problems created by the institution of slavery. You could remove the chains, but if you did not develop the institutions that would allow for the incorporation of previously enslaved people into a democratic society, then slavery would not be abolished.