An organization that sought to prevent any establishment of the rights of blacks was the

Ku klux klan

first kkk was a militant organization which main point was fighting the carpetbaggers in the south, second kkk most powerfull was founded in 1915, it's main target was opposition to jews and catholics and support of racial segragation, in it's height in early 20's klan had around 4 million members. third clan was established in 1945 and rose to power in early 60's to target civil ights act and fight with rights of african americans