Do you know if the Detroit family was able to gain control of the policy racket in the city or areas? I read from the book African-American Organized Crime: A Social History that in Detroit the policy kings/operators formed an alliance to counter the detroit crime family but I haven't been able to find more sources of that event.
I don't know of anything written about the numbers racket in Detroit back then. Relatively little has been written on it in general, it seems. One book that came out in the 1990's,
The New Ethnic Mobs, said the city's mob family had ceded the numbers rackets to the blacks long ago. But extorting numbers operators was among the charges in the big 1996 bust. I think they were fellow Italians or Middle Eastern (mainly Chaldean) gamblers though. I don't think the Detroit family had much interaction with the blacks by that point.
