Upon his arrival in New York, Jones became involved in city politics, serving as an election inspector in 1921 and working for
John Francis Hylan, the Democratic candidate for mayor. Jones was enthused by Hylan's proposal to maintain 5 cent fares for New York City subways, but his primary focus was on registering and organizing Black voters in
Harlem and ensuring the appointment of Black judges. According to Jones, he was inspired to found the George Washington Carver Democratic Club during the 1921 campaign, when he delivered voter registration books to the whites-only Cayuga Club and was told he had come to the wrong place. In 1944, Jones was elected Democratic leader for
New York's 13th State Assembly district. He worked closely with Mayor
William O'Dwyer, who appointed him deputy commissioner of the
New York City Department of Housing and Buildings. In
1956,
Adam Clayton Powell Jr. endorsed Eisenhower over Stevenson, breaking with Tammany Hall and the Democratic Party. The Democratic machine put up a primary challenger to Powell in the form of Earl Brown. Jones ran Powell's campaign, easily beating Brown and demonstrating to Tammany they had no power in Harlem. At the 1960 Democratic National Convention, Jones and Powell supported
Lyndon B. Johnson on the first ballot over John F. Kennedy as part of a political deal with
Sam Rayburn. In exchange, Rayburn appointed Powell as chairman of the
House Committee on Education and Labor. In this role, Powell secured the passage of numerous pieces of landmark legislation during the Kennedy and Johnson administrations, including a large portion of the
Great Society programs. Using their influence with the Johnson administration, Powell and Jones succeeded in having allies appointed to federal offices.
Constance Baker Motley became the first Black woman appointed to the federal judiciary, and
Robert Clifton Weaver was appointed the first
United States Secretary of Housing and Urban Development, a position created at Jones's urging. Weaver was also the first Black member of the
federal cabinet. In 1966, Jones was part of the coalition that helped make Bertram L. Baker the first Black majority whip in the history of the New York State Assembly. At the time, this was the highest state office to which any Black politician had ascended.
Tammany Hall After Jones opposed Tammany Hall in 1961 by supporting Robert F. Wagner Jr. for re-election, Jones was elected its leader in 1964, after the ouster of
Carmine DeSapio. In 1965, he supported Wagner's choice,
Paul R. Screvane, for mayor. As county chair, Jones came into conflict with U.S. senator
Robert F. Kennedy, who joined reform efforts to end
Tammany Hall influence and machine politics in New York City by backing an anti-machine candidate for Surrogate Court in the 1966 Democratic primary. Jones resigned as county leader and district leader in 1967 and left politics entirely. Jones supporter Stanley Ferris observed, "Harlem hasn't voted Republican in 30 years. And this was our reward. Black leaders get discouraged. You work hard, deliver the vote, get a little power, and they pull you down. I don't know, maybe if Kennedy would adopt some Negro leader and boost him up, we might get some initiative back." He endorsed
John Lindsay for re-election in 1969. ==Political legacy==