Briefly explain how crime has been racialized.

Would the answer be (This is my introduction when I have to write a paper): There are so many police brutality happening against African Americans and so little against Whites. There are lack of police training.

What are some other things I could add? Any help would be greatly appreciated.

You need to add numbers or percentages, for one thing!

What does "so many" mean?
What does "so little" mean?

Go to https://scholar.google.com and type this in: "how crime has been racialized"
Read lots and lots and take good notes, including the websites where you got your info from.