Give 2 examples for when and why the federal government and executive branch intervened with the civil rights movement of the 50′s, 60′s and possibly beyond.

Give 2 examples for when and why the federal government and executive branch intervened with the civil rights movement of the 50′s, 60′s and possibly beyond. Include examples from school desegregation and other examples. Be sure to specify what time period you are talking about and who the key people were.