So what should I do about the inner city children not playing nice?

I teach at a pre school , and Daquante pulled out a gun on little Timmy and he was like yo gimme yo damn lunch money ho , and i was like Daquante get to the corner and he said b*tch you ain't my momma , I am so scared of Daquante he is like the gang leader in the cl , he terrorizes all of the little white kids , and they are in danger , how can I protect the white children in my cl they must stay pure .