A Bonanno crime-family soldier called “The Maniac” forced one of his loan-sharking victims to get naked to see if he was wearing a wire, barking, “Take off your f–king pants right now!” prosecutors said Tuesday.

John Ragano, 62, allegedly made associate Vincent Martino strip while threatening to “slap the s–t out of him” if he was wearing a wire for the feds during a meeting July 5, 2023, just five days before Ragano was to be sent to prison in a Brooklyn federal racketeering case.

“OK, well, then take off your f–king s–t right now, my man. Take off your f–king pants right now, lemme see, I want to see,” a raging Ragano allegedly instructed Martino at his office when the underling denied being wired up.

Martino, who apparently had a wire on his clothes, followed Ragano’s instructions — and somehow still managed to secretly record the whole meeting anyway, even as he stood naked while two other men stood behind him with a crowbar and another with a tire iron, federal prosecutors have said.

“John Ragano forced a man who owed money to strip naked in a garage in Queens and threatened to slap the s–t out of him,” federal prosecutor Andrew Reich said at the beginning of Ragano’s trial in Brooklyn Federal Court.

Another mob associate, Broadway-show-tunes singer-turned-criminal Andrew Koslosky, 66, testified that he collected loan payments from Martino for Ragano — who he painted as a hair-trigger-tempered “big fella.

“He made it clear that people didn’t want to cross him,” Koslosky said.

During Kolosky’s testimony, jurors were shown a photo of how he recorded payments in an envelope named “Italian” — while another photo showed stacks of cash amounting to $6,200 that was paid by Martino in April 2021.

“When he put his fist down on the desk, the whole room shook,” Koslosky said of Ragano, who is charged with extortion, harassing a witness and witness tampering.

Martino — who went into the marijuana trafficking business with Ragano — had taken a $150,000 loan from Ragano in February 2021 and he agreed to pay $2,050 in interest per week until the loan was paid off in full in cash, according to prosecutors.

But Martino stopped making payments at some point, and he began working with the feds in March 2023, when he agreed to start recording any conversations he had with Ragano and his debt collectors, Reich said.

Martino went on to make a slew of $1,000 payments after cooperating with the feds, but in June 2023, he was told by one of Ragano’s guys that the Mafioso wanted to discuss “an issue” with the loan in person, prosecutors alleged.

Martino then met with Ragano that July 5 and told Ragano that he wanted to stop repaying the loan.

Both men accused each other of working for the feds before Ragano made him strip off his clothes, according to court papers.

The alleged shakedown came just five days before Ragano was to report to prison for nearly five years after pleading guilty to extortion charges in November 2022.

Martino testified late Tuesday that he resorted to taking “street loans” — slang for taking cash from the Mafia — during the pandemic in 2020 after falling on hard times when his construction company failed to take off in 2018.

He racked up $125,000 in debt from members of the Columbo crime family before turning to the Bonannos for another $150,000 because he was falling behind on debt payments, Martino testified.

Martino wound up owing the mob $275,000, according to prosecutors.