Who is Robert Kennedy from Lyndon Johnson and the American Dream and what is their importance?

Senator Robert Kennedy became Attorney General during his brother's administration. After President Kennedy's death, Johnson kept all of his cabinet intact, and Robert remained a part of the Executive Branch until Johnson's election in 1964. Robert Kennedy opposed most of Johnson's political behaviors, and in turn, Johnson despised him. Robert's popularity with the public, however, and his base of power within the government, precluded Johnson's ability to quash his increasing criticism.