In 1964 Wachtel and his wife accompanied the Kings to Oslo, Norway when King was awarded the Nobel Peace Prize. The prize increased FBI director
J. Edgar Hoover's animus towards King, who told Wachtel of his fears that Hoover would expose his sexual affairs to the public. Wachtel supported King in his antipoverty offensive, along with Jones sending King statistics on poverty, and recommending that King broaden his campaign to include many poor, rural whites. In the face of opposition from governor Wallace and the police, Wachtel helped King plan the 1965
Selma to Montgomery marches. Following clashes in Selma, he was instrumental in helping to arrange meetings between King and the Vice President and President,
Hubert Humphrey and
Lyndon B. Johnson, in 1965–66. At King's arrest, Wachtel and Jones placed a full-page advertisement in the
New York Times titled "Letter from the Selma Jail," in which King wrote, Wachtel and Jones were unaware that King had been released from prison by the time the letter appeared, and that King was therefore open to public criticism. To address this dilemma, Wachtel and Jones announced that King had been released from prison in order to meet with President Johnson at the White House, taking Johnson by surprise. Using his White House contact Lee White as an intermediary, Wachtel desperately tried to organize the meeting, while Johnson was furious at what he regarded as King's self-invitation. The FBI, who were wiretapping Jones, attempted to disrupt the meeting by identifying Wachtel as a Communist Party member to the President. Like Levinson, Wachtel had been a member of the Communist Party of the United States of America. Johnson, under powerful pressure to enact Civil Rights reforms, announced that he would recommend that Congress pass a voting rights act, and that Vice President Humphrey and Attorney General Katzenbach would meet with King. Through White, Johnson informed Wachtel that if King maintained total secrecy, Johnson would meet with King during his meetings with Humphrey and Katzenbach. Wachtel handled King's estate after his assassination, became
Coretta Scott King's personal lawyer, and helped her negotiate a book contract to publish remembrances of her husband. He served as vice president and legal counsel for the Martin Luther King Jr. Center for Nonviolent Social Change from 1969 until 1982. At different times he served as vice president for the American Foundation for Nonviolence, and as a trustee for the Southern Christian Leadership Conference. ==FBI surveillance==