Dave, I have been reading about Manchester gangs, and it appears that their activities are purely criminal and not racial.
Again I challenge you to identify any errors in my post.
It is clear that you know much less about this than you pretend.

Here the killing of Abdi's friend is described.
"A feud between two south Manchester gangs is behind the outbreak of violence in Moss Side which has resulted in two murders since December, police believe. Tensions between teenage members of the Moss Side Bloods - an offshoot of the infamous Doddington crew - and the Rusholme Crips have erupted over the last few months, according to a senior police source. "

"However, two murders and one attempted murder which took place in Moss Side since December are being linked to the feud. Abdul Wahab Hafidah, 18, was run over by a Vauxhall Corsa on Moss Lane East during the evening rush-hour before the occupants stabbed him in his neck and abdomen on May 12."
http://www.itv.com/news/granada/2016-05-25/gang-feud-behind-outbreak-of-violence-in-manchester/

Wiki,
"Analysts trace the high rates of gun crime in south Manchester, England, to acute social deprivation in an inner city area south of Manchester city centre stretching from Hulme through Moss Side to Longsight.[1] Whilst by the 1990s, the trade in illegal narcotics and firearms had given rise to Manchester's nickname of "Gunchester", by the late 2000s levels of gang related gun crime had greatly reduced in the area as a whole.[1][2]
The reasons for this transformation are not entirely clear but the heavy sentencing of main offenders, prohibiting the availability of firearms, community working and co-operation in tackling this kind of crime may have all played a role"
https://en.wikipedia.org/wiki/Gun_crime_in_south_Manchester

More reading,
http://www.mirror.co.uk/news/uk-news/britains-worst-gang-war-sparked-6922214

http://www.mancunianmatters.co.uk/content/190272635-manchesters-gangs-exposed-dj-dave-haslam-asks-uncomfortable-questions