What could they possibly have in common?

From the Toronto Star (hat tip: Kathryn Jean Lopez):

In investigators' offices, an intricate graph plotting the links between the 17 men and teens charged with being members of a homegrown terrorist cell covers at least one wall. And still, says a source, it is difficult to find a common denominator [emphasis added].

Is it really that difficult? Try this on for size: the names, insofar as the Star provides them, of the accused:

Qayyum Abdul Jamal
Ahmad Mustafa Ghany
Yasin Abdi Mohamed
Mohammed Dirie
Fahim Ahmad
Steven Vikash Chand -- oh, no, wait, since his conversion to Islam he goes by "Abdul Shakur"
Yasin Abdi Mohamed

Hmmm...nope, I don't see any common theme. Perhaps others brighter than myself and the Star could help us out? It's a real poser, this one...