Maybe they will get their own little Islamberg.
The DC Sniper seems to have had connections with ul-Fuqra
While I agree with other posters that Black Americans are unlikely to engage in suicide bombing, there is a lot of damage that can be done by people who can operate without notice as security guards, drivers, and other jobs that would be useful in scouting targets
Also, an alliance that results in Afghan drugs going to US gangs in exchange for terrorism support, can create some issues