How did the Ku Klux Klan help to undermine Congress's efforts to ensure equal rights to freedmen?

Ku Klux Clan is an organization that used violence and the threat of violence to thwart perceived challenges to white supremacy and Democratic rule. “Its mayhem was intended, among other purposes, as a means of controlling black labor, reinforcing social deference to whites, disciplining perceived instances of interracial ual relationships, and punishing any whites sympathetic to or working on behalf of the Republican Party.” Their purpose was to enforce the Fourth Amendment to the Constitution of the United States. Ku Klux Klan was so convince that The Reconstruction is antagonistic and repressive against the White Americans. “They also generally believed in the innate inferiority of blacks and therefore mistrusted and resented the rise of former slaves to a status of civil equality and often to positions of political power.” Due to such principle, the Ku Klux Klan was an impediment to the Congress objective and efforts to ensure equal rights and equal protection of the laws.