The black/the blacks

[Xinfu]

-John became a symbol of what protesters say was police brutality aginst blacks.
-John became a symbol of what protesters say was police brutality aginst the blacks.

What's the difference? If both correct.

[Rusty]

-John became a symbol of what protesters say was police brutality against blacks.
-John became a symbol of what protesters say was police brutality against the blacks.

What's the difference? Are both correct?Both the term without the article and the one with the article may be used with no difference in meaning.

[Xinfu]

Thank you. Do you think any difference would be made by turning b into a capital letter?

[Rusty]

No difference in these sentences.

[Xinfu]

Thank you.