When the students did not budge , the NAACP joined their battle against school segregation .
Some local leaders of the NAACP had tried to persuade the students to back down from their protest against the Jim Crow laws of school segregation .
When the students did not budge , the NAACP joined NAACP 's battle against school segregation .
Some local leaders of the NAACP had tried to persuade the students to back down from their protest against the Jim Crow laws of school segregation .