Answer: Discrimination/Hate messages
Explanation: During integration, Ruby Bridges and several other Black children were essentially "shipped" to White schools. Parents from the school reacted aggressively, and pulled their children from the school districts. In some cases, parents (particularly mothers), would stand outside the school building and spit on them, shout death threats, throw feces, push them- pretty much anything they could to intimidate them.
I'll paste a link to a Ruby Bridges movie in the comments.
Hope this helps!