Except in some cases, the migrants will outgun the locals.
And MS-13 ain't afraid of the "five families."
There’s plenty of gangs out there that are violent. What I see happening is illegal immigrants from one ethnic group will be moved into areas of NYC dominated by another ethnic group.
It will be inevitable that different ethnic groups will begin to fight each other, when these group have criminal elements in them the criminals will begin to fight each other over turf.
I’ve read a couple of articles recently that different groups from Africa that were fighting in Africa have come to the USA and continued the fighting here.