A homeowners group has spent nearly $1 million dollars in its three-year war against Forest Hills Stadium — a fight that has completely cut off the private nabe’s steady revenue stream from the open-air venue’s concerts, The Post has learned.

The Forest Hills Gardens Corporation’s board has unilaterally waged the expensive battle without approval from its 4,000-person-strong community, a move that an insurgent group of residents said has caused the private enclave’s quality of life to fall by the wayside.

“There is no accountability,” said Jeff Mitchell, a 26-year resident of the private neighborhood.

“They have made it seem as if there are 4,000 people who live in the neighborhood who support this. That is absolutely false,” Mitchell went on. “Dare I say, most people in the neighb

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