Found this article but most everything that Google is giving me is from paywalled academic journals - if you have any other recommended reading please let me know.

https://www.blackagendareport.com/some-critics-argue-internal-colony-theory-outdated-heres-why-theyre-wrong

Edit - Particularly interested in more recent work. The Robert Allen study on internal neocolonialism they cite is from 1969 and the Lawrence Friedman book that discusses “differential segregation” is from 1970, and I’m curious to see this applied to post-2008 developments as well.