Final answer:
Alabama governor George Wallace was preventing the implementation of federal laws according to Dr. King's call-out. President Johnson introduced the Voting Rights Act of 1965 to remove obstacles for African American voters.
Step-by-step explanation:
Dr. King specifically called out the actions of Alabama governor George Wallace who was preventing the implementation of federal laws. In response to the violence and Governor Wallace's refusal to address it, President Lyndon B. Johnson introduced the Voting Rights Act of 1965 to remove obstacles for African American voters and lend federal support to their cause. The act prohibited states and local governments from passing laws that discriminated against voters on the basis of race, thus outlawing literacy tests and other barriers to voting.