Here you have it:

Don Carlo

In the early 1960s, Gambino slowly moved against the prominent Anastasia loyalists, headed by caporegime Armand "Tommy" Rava. With Joseph Biondo as a solid underboss, Joseph Riccobono as Gambino's own consigliere, and with his top caporegimes, Aniello "Mr. Neil" Dellacroce, Paul "Big Paul" Castellano, Carmine "The Doctor" Lombardozzi, Joseph "Joe Piney" Armone and Carmine "Wagon Wheels" Fatico, the remaining Anastasia loyalists could never make a move.

Gambino quickly expanded his rackets all over the country. New Gambino rackets were created in New York, Chicago, Los Angeles, Miami, Boston, San Francisco and Las Vegas. Gambino also, to regain complete control of Manhattan, took over the New York Longshoremen Union, where more than 90 percent of all New York City's ports were controlled. It was a great time, when the money rolled in from every Gambino racket in the U.S. and worked its way up to become America's most powerful crime family. Gambino also made his own family policy: "Deal and Die." This was Gambino's message to every Gambino family member; heroin and cocaine were highly lucrative, but were dangerous, and would also attract attention. The punishment for dealing drugs, in Gambino style, was death.

In the 1960s, the Gambino family had 500[8] (other sources have 700[9] or 800[10]) soldiers, within 30 crews making the family a $500,000,000-a-year-enterprise. In 1962, his eldest son Thomas Gambino married the daughter of fellow mob boss Tommy Lucchese, the new head of the Gagliano crime family, whom Gambino would become close to as a partner, friend, and relative. More than 1,000 people, relatives, friends, and amico nostro ("friends of ours"), were present during the wedding-ceremony. It has been rumored that Gambino personally gave Lucchese $30,000 as a "welcome gift" that same day.

As repayment, Lucchese cut his friend into the airport rackets that were under Lucchese control, especially at John F. Kennedy International Airport, where all unions, management, and security were controlled by Lucchese himself.

After Joseph Bonanno was forced into retirement by the Commission, Vito Genovese died of a heart attack, and Tommy Lucchese died of a brain tumor, Gambino's status and power on the Commission was elevated almost immediately.

While the Mafia had abolished the title of "boss of bosses," Gambino's position afforded him the powers such a title would have carried, as he was now the boss of the largest, wealthiest, and most powerful crime family in the country and was the head of the Commission, a position only Luciano had held before Gambino.

According to the feds it remained this way until a few years after GOTTI was arrested as he lost control of the Gambino's at such time, CHIN seized control:

Federal and state officials say that since Mr. Gotti, the head of the Gambino family, was convicted of murder and racketeering in 1992, the rival Genovese organization has supplanted the Gambino family as the most powerful Mafia group in New York and the nation.
The shift has placed significant power in the hands of Vincent Gigante, the boss of the Genovese family and now the decisive voice on the Mafia's commission, the group that sets mobster policies and resolves disputes.