On this page : NYPD Officer Peter Liang found guilty of manslaughter in stairwell shooting that killed Akai Gurley, around 3rd screen in the middle, we have this sentence
Meanwhile, supporters of Liang, who is Chinese-American, have said he has been made a scapegoat for past injustices.
"supporterS" vs "who IS" vs "HAVE said"?
What I guess is here considers "supporters" as a whole, like "a people" means a certain group of people, am I right?
Even if yes, I still think this is too subtle for me, would you please give me another example so that I can will have an idea when to use this kind of structure?
Also, how will the meaning change if I replace "is" with "are"?