I think the best conclusion that can be drawn about the "Flexibility Riders" is some youthful, white Americans bolstered combination and equivalent rights for African-Americans. Opportunity Riders were social equality activists who rode interstate transports into the isolated southern United States in 1961 and consequent years keeping in mind the end goal to challenge the non-requirement of the United States Supreme Court choices Morgan v. Virginia (1946) and Boynton v. Virginia (1960), which decided that isolated open.
So that the Panama Canal could be built. This would make it easier for the United States to move their ships from the Atlantic to the Pacific and vice versa.