Jewish teachers are outraged over a full-sized Palestinian flag that’s been hanging in the hallway of a Brooklyn high school for months — as their complaints to education bosses fall on deaf ears.

The banner has been prominently displayed at Leaders High School in Gravesend, which shares space in the Lafayette Educational Complex, since at least April, said Moshe Spern, president of the 250-member United Jewish Teachers group.

It’s unclear who hung the flag — or why.

Spern believes the flag violates city regulations prohibiting political activities on Department of Education property. He emailed Principal Thomas Mullen on Tuesday, noting that “members of the Lafayette school community” have complained about the flag since the end of last academic year. 3

“I told [the people compla

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