The New York City principals union is being accused of lacking transparency over its quiet — and “abusive” — ouster of a “highly regarded” official, according to members.

Sana Nasser — a union exec for nine years and city principal for 16 years — was immediately dismissed by Council of School Supervisors and Administrators president Mark Cannizzaro in early June, according to a termination letter obtained by The Post.

At a closed-door meeting that same day, June 7, Nasser and Cannizzaro got into a disagreement over staffing — which allegedly escalated until the union prez, pointing at Nasser, yelled at the veteran educator to pack up her office.

“The reaction just did not match whatsoever the conversation that was happening,” Nasser recently told The Post.

The principals’ union, including five people at the meeting that officials connected with The Post, denied Nasser’s characterization of the dispute.

Thousands of the labor union’s members found out that Nasser was no longer with CSA just before Labor Day weekend, when some school administrators — many of whom were mentored by Nasser and sung her praises — began asking questions on an email chain about her ouster.

“As every hour passes, it’s becoming more and more suspicious why our union president won’t speak to us,” Bronx High School for Law and Community Service principal Michael Barakat told The Post last week.

“Clearly, there’s a culture in the leadership of CSA that believes it’s OK not to speak to the membership that supports CSA, that pays their salaries,'” he said.

Following The Post’s inquiries about the incident, the union addressed the allegations in a regular weekly update email to members Friday afternoon.

Officials denied the allegations that Nasser’s termination was abusive.

“The information and allegations recently shared with our members on this subject are untruthful,” said spokesperson Craig DiFolco — alleging that “everyone else” at the meeting attested the matter was handled “completely appropriately.”

“Otherwise, this is a confidential personnel matter,” DiFolco added.

The dispute centered around field staff for the union, which the president asked Nasser to continue outside of the executive leadership team meeting, according to both parties’ accounts of the events.

Nasser said that Cannizzaro asked her to send him an email — and she pushed back, saying she’d already done that but would do so again. According to her account, Cannizzaro — raising his voice and pointing — told her, ‘You want to do this now?’ and ‘You’re not going to like it.’ He then stood up and asked her to pack up her things, she claimed.

General counsel David Grandwetter, claiming that Cannizzaro “repeatedly attempted to de-escalate the situation,” said the president was asking Nasser to have a private conversation with him in his office — “rather than continue the exchange in front of the five others in attendance.”

But when Nasser questioned whether she was valued at the union, Cannizzaro replied, “If that’s truly the way you feel, you can pack up your office,” according to Grandwetter’s written statement.

The other top-ranking officials endorsed Grandwetter’s account of events.

But Nasser said attendees approached her after she left the room, telling her they did not want to see her go and “know how he is,” referring to Cannizzaro.

She added that a vice president also called her the next day asking how they were going to “present this to the family” — other union members — and asked if they could say it was a mutual separation.  

DiFolco, the spokesperson, said no one present suggested to Nasser afterward that the meeting was handed inappropriately, and an official called to “check in as a professional courtesy” and how she wanted to privately communicate why she left.

Cannizzaro earns a $287,870 annual salary for the local union, according to public filings.

The principals union told The Post its policy is not to communicate publicly to members about personnel decisions, such as Nasser’s termination.

But some principals believe the union leadership intentionally misled them.

“I believe that information was made purposefully vague because too many of us would be upset to learn that she was terminated,” wrote Meagan Colby, principal of Benjamin N. Cardozo High School in Queens, via email.

“I avoid the internal politics of the union as much as possible, but in this case I cannot hold my tongue,” she added.

In The Bronx, Lehman High School principal John Powers in an email shared with The Post called the lack of information from Cannizzaro “deafening.”

“Your reluctance to bring to light the circumstances of Sana Nassar’s [sic] abusive treatment and tyrannical firing serves to weaken our union,” Powers said.

The former union executive, who said she does not want her job back, told The Post the controversy is about more than her own personal situation.

“No one wants to put out that there were terminated. This is not a badge of honor,” said Nasser.

“I don’t think us in central CSA communicate fully and openly. I don’t think we’re being transparent.”