The murdered head of the Gambino crime family was buried on Staten Island on Tuesday after a service attended by a little more than a dozen mourners — all under the watchful eye of authorities armed with high-powered cameras across the street.

Around 9:30 a.m., several cars including black Mercedes and a Chevy Suburban pulled up to the Scarpaci Funeral Home in Tottenville and drove around back for a service for Francesco “Franky Boy” Cali.

A pewter-gray Maserati Quattroporte remained in front of the funeral home as its male driver hopped out and went inside, leaving a woman dressed in black in the car.

Meanwhile, four unmarked black law enforcement cars were parked across the street, each with a male driver armed with a hand-held radio that they used to communicate with each other — and cameras with 500mm lenses about a foot wide.

As the cars drove by, the authorities snapped photos. At least two of them confirmed to The Post they were “law enforcement,” and a source separately said they were both FBI and NYPD.

“That’s just Standard Investigation 101,” the source said of the authorities’ photos. “They want to know who shows up, who the players are, who’s going to possibly take over, who’s active, who‘s not, the pecking order.

“Unfortunately, it’s very limited,” the source added of the scope of the group. “But they have to take what they can get.”

Then at 10:30 a.m. on the dot, cars began racing from the funeral home and headed to the Moravian Cemetery in New Dorp, where Cali was buried.

He was gunned down last Wednesday night outside his home, allegedly by right-wing nut and construction worker Anthony Comello.

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