B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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136. A lawyer who has been informed of an inquiry or a complaint regarding him must not communicate, directly or indirectly, with the person who is the source of the inquiry or who filed the complaint, unless he has the prior written permission of a syndic of the Barreau.
Moreover, he must not intimidate a person or retaliate or threaten to retaliate against the person because the person participated or cooperated or intends to participate or cooperate in such an inquiry or complaint, reported or intends to report conduct contrary to this code, or availed himself of a right or recourse set forth in a regulation adopted under the Professional Code (chapter C-26) or the Act respecting the Barreau du Québec (chapter B-1).
O.C. 129-2015, s. 136.