An off-duty police officer will now be present at meetings of the Toronto District School Board until further notice.
The board's chair, Chris Bolton, has decided to take the drastic measure after receiving a letter from staff complaining of intimidation.
The letter, from director of education Donna Quan, states that staff were being threatened by a trustee.
Trustee Sam Sotiropoulos tells CTV that at a committee meeting on Wednesday, trustee Howard Goodman intimidated Quan over the non-payment of board membership fees.
Goodman says that if asked to apologize, he will do so.
Quan's letter says that it appears the TDSB has come "to condone a culture where it is acceptable for staff members to be subjected to abusive, threatening and insulting comments by elected officials."
Bolton also says that the door between the trustees' office and senior staff offices will be locked.