These Chicago “Black Israelites” are not Ethiopians but an African-American “Israel identity” cult. I believe they have a controversial settlement in Demona, Israel.
This group might claim to be Jewish and possibly are the mising tribe but they are not really part of the mainstream Jewish movement. I went out and checked their website and the movements web site and from my Reform Jewish roots I find them to be questionable. But hey what do I know anyway.
It's related to this group: http://en.wikipedia.org/wiki/Commandment_Keepers
The main breach they have with the regular Jewish community is a refusal by many of them to formally convert.