Charter school officials blasted a pair of Democratic New York state lawmakers who called to investigate a rally last week — saying the duo were working as muscle for the teachers union.

Pro-union state Sens. John Liu and Shelly Mayer — who chair influential committees that oversee Big Apple schools — urged state education officials to investigate whether a pro-charter school rally attended by 15,000 parents and students violated state law.

But charters fired back that the Sept. 18 rally, which had marchers cross the Brooklyn Bridge, was “not a partisan display.” 4

“It was the most fundamental expression of civic life — families demanding fairness, equity, and access to quality education,” said a letter to the senators, signed Tuesday.

Liu (D-Queens) and Mayer (D-Westchester) ha

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