Three families at St. Bernard’s School accused the executive committee of the school’s board of trustees of self-dealing, threats and deception in an amended petition filed Monday in Manhattan Supreme Court.

Attorneys from Walden Macht & Haran, which is representing the families in the proposed class action suit, filed an initial petition in March arguing that the school’s longtime headmaster, Stuart Johnson, was forced to lie to the school community after board of trustees members compelled him to resign.