What Can Be Done to Stop a Person From Using Legal Proceedings As a Tool of Harassment to Cause Distress to Another Person?
When the Court System Is Being Misused As a Tool to Harass the Court May Declare the Abuser As a Vexatious Litigant. A Vexatious Litigant Will Thereafter Require Special Permission Prior to Commencing Further Legal Proceedings.
Understanding the Requirements When Seeking a Vexatious Litigant Declaration Including Abuse of Court Process
Courts are intended to provide readily accessible processes in the pursuit of justice for persons who wish to pursue redress for a perceived wrongdoing by another person. Used for this purpose, the courts can deliver justice; however, the court process can be used as harass and victimize. Persons found abusing court processes may be deemed vexatious litigants.
Both the statute law, per the Courts of Justice Act, R.S.O. 1990, c. C.43, as well as the common law, per various cases including Anthony v. Vinczer, 2021 ONSC 6481 address the issue of declaring a person as a vexatious litigant. Specifically, the Courts of Justice Act and the Anthony case each respectively state:
140 (1) Where a judge of the Superior Court of Justice is satisfied, on application, that a person has persistently and without reasonable grounds,
(a) instituted vexatious proceedings in any court; or
(b) conducted a proceeding in any court in a vexatious manner,
the judge may order that,
(c) no further proceeding be instituted by the person in any court; or
(d) a proceeding previously instituted by the person in any court not be continued,
except by leave of a judge of the Superior Court of Justice.
 The rationale underlying s. 140 was discussed by Blair, J.A. in his dissenting opinion in Foy v. Foy (1979), 1979 CanLII 1631 (ON CA), 26 O.R. (2d) 220. Though he was describing provisions of the Vexatious Proceedings Act, that legislation preceded the present s. 140 of the Courts of Justice Act and the rationale remains the same. Blair, J.A. described the object of the legislation as follows:
It is not difficult to perceive the object of the Vexatious Proceedings Act. The protection afforded honest litigants by the exercise of the Court's inherent jurisdiction to control abuse of process is subject to a serious limitation. It can only be exercised ex post facto. The vexatious litigant has the luxury of being able to initiate proceedings and to force the other party to the expense and inconvenience of responding. The severe financial burden which can be inflicted on a responding party is made obvious by this case. Moreover, the onus of proving that a proceeding is an abuse of process will always be on the responding party. Clearly the purpose of this legislation was to overcome the unfair advantage enjoyed by a vexatious litigant and, in cases where an order is made under the Act, to place upon him the onus of establishing that any proposed proceedings are not an abuse of the process of the Court. Significantly, the vexatious litigant is not deprived of the right to bring proceedings. Rather, the burden is shifted: the vexatious litigant must establish to the Court's satisfaction that there is a prima facie ground for the proposed proceedings.
 More recently, Myers J., of this court, described the mischief caused by vexatious litigants and the difficulties encountered by those responding to vexatious proceedings in the following terms:
Experience teaches that vexatious litigant proceedings can be very expensive and often serve just to give a vexatious party yet another opportunity to inflict the very harms that the process is designed to end. To obtain a vexatious litigant order, an applicant must commence a separate proceeding and prove that the target has persistently and without reasonable grounds instituted vexatious proceedings or has conducted proceedings in a vexatious manner. The requirement to show persistence has meant that litigants must endure several vexatious proceedings prior to bringing a vexatious litigant proceeding. While courts have recognized that vexatious litigants can inflict substantial costs on the opposing parties and significant systemic costs, the harm is amplified by the need to endure multiple frivolous proceedings before section 140 applies. Moreover, an application for a vexatious litigant declaration is a separate legal proceeding. This gives the vexatious litigant a platform from which to repeat all of her or his vexatious conduct. The respondent in a vexatious litigant proceeding has all of the rights of a respondent to a regular application -- i.e. to file evidence, to cross-examine, to summon third party witnesses, to bring motions, and, especially exhausting and expensive, the right to or to seek leave to appeal at every step of the way. In virtually all of these cases the respondents are impecunious and will not be able to pay the costs awards that they invariably rack up along the way to being declared vexatious litigants. Furthermore, as legal proceedings are protected from the laws of defamation, some vexatious litigants will use the process to publicly defame the applicants or others with no accountability.
 Myers J. went on to describe the characteristics typically seen with vexatious litigants. They include:
(a) The commencement of multiple proceedings in an effort to re-determine already determined issues;
(b) Rolling forward grounds and issues from prior proceedings;
(c) Persistent pursuit of unsuccessful appeals;
(d) Failure to pay cost awards;
(e) Bringing proceedings for a purpose other than the assertion of legitimate rights; and,
(f) Bringing proceedings where no reasonable person would expect to obtain the relief sought.
See Gao, at paras. 14-15.
 Gao has been cited with approval by the Court of Appeal on a number of occasions including, Scaduto v. The Law Society of Upper Canada, 2015 ONCA 733, 343 O.A.C. 87, at para. 9, leave to appeal refused,  S.C.C.A. No. 488; Khan v. Krylov & Company LLP, 2017 ONCA 625, 138 O.R. (3d) 581, at para. 13; Rallis v. Myers, 2019 ONCA 437, at para. 5; and Lochner v. Ontario Civilian Police Commission, 2020 ONCA 720 at para. 20.
 In Lochner, the Court of Appeal referenced an article written by Justice Yves-Marie Morisette of the Court of Appeal of Quebec entitled, "Querulous and Vexatious Litigants as a Disorder of a Modern Legal System", 24 Can. Crim. L. Rev. 265. At pp. 275-275, Justice Morisette described a querulous litigant as one often exhibiting the following characteristics. He or she:
(a) Is self-represented;
(b) Demonstrates a stubborn attitude;
(c) Persistently reiterates and amplifies;
(d) Makes arguments that are unintelligible or highly confusing;
(e) Files written submissions that do not contain much that is legally relevant to the dispute and which are written in a distinctive style;
(f) Markedly fails to conduct due diligence in the advancement of claims;
(g) Exhausts all rights of appeal any time there is an adverse judgment;
(h) Makes unsustainable allegations and gratuitous complaints against members of the legal profession; and,
(i) Ceases proceedings only when unable to pay legal fees and costs.
Interestingly, per the Anthony case while citing Lochner v. Ontario Civilian Police Commission, 2020 ONCA 720 raises the key point that even a vexatious appearing litigant, or even a person previously declared a vexatious litigant, may be raising a legitimate legal issue; and accordingly, the courts should be careful to consider the issue raised prior to jumping to the conclusion that a matter is vexatious and merely an abuse of process.
A person may be declared as a vexatious litigant when a courts identify the person as engaging in misuse of the court system for an improper purpose such as commencing legal proceedings to victimize another person. When a legal proceeding is deemed vexatiously brought for an improper purpose, the court may stop the proceeding with what is known legally as a Stay. The court may also deem a person who misuses the court process as a vexatious litigant and impose conditions to limit access to the court system such as a mandate that the person obtain special permission, known as Leave of the court, prior to commencing future proceedings. Whereas declaring a person as a vexatious litigant is done only with great caution, the court will weigh many factors prior to doing so.