The term "persecuted" is not defined by the Convention or the Protocol. But not every threat of harm to a person or interference with his or her rights for reasons of race, religion, nationality, membership of a particular social group or political opinion constitutes "being persecuted". The notion of persecution involves selective harassment. It is not necessary, however, that the conduct complained of should be directed against a person as an individual. He or she may be "persecuted" because he or she is a member of a group which is the subject of systematic harassment: Gagliardi, The Inadequacy of Cognizable Grounds of Persecution as a Criterion for According Refugee Status, Stanford Journal of International Law, vol. 24 (1987), 259 at p. 269; Goodwin-Gill, op. cit., at pp. 44-45; Grahl-Madsen, op. cit., at pp. 185-186; M.A. A26851062 v. Immigration and Naturalization Service [64] ; Gunaleela v. Minister for Immigration and Ethnic Affairs [65] ; Periannan Murugasu v. Minister for Immigration and Ethnic Affairs [66] . Nor is it a necessary element of "persecution" that the individual should be the victim of a series of acts. A single act of oppression may suffice. As long as the person is threatened with harm and that harm can be seen as part of a course of systematic conduct directed for a Convention reason against that person as an individual or as a member of a class, he or she is "being persecuted" for the purposes of the Convention. The threat need not be the product of any policy of the government of the person's country of nationality. It may be enough, depending on the circumstances, that the government has failed or is unable to protect the person in question from persecution: Goodwin-Gill, op. cit., at p. 38; Hyndman, The 1951 Convention Definition of Refugee: An Appraisal with Particular Reference to the Case of Sri Lankan Tamil Applicants, Human Rights Quarterly, vol. 9 (1987), 49, at p. 67; U.N.H.C.R. Handbook, par. 62; McMullen v. Immigration and Naturalization Service [67] ; M.A. A26851062 [68] ; Rajudeen v. Minister of Employment and Immigration [69] . Moreover, to constitute "persecution" the harm threatened need not be that of loss of life or liberty. Other forms of harm short of interference with life or liberty may constitute "persecution" for the purposes of the Convention and Protocol. Measures "in disregard" of human dignity may, in appropriate cases, constitute persecution: Weis, The Concept of the Refugee in International Law, Journal du Droit International, (1960), 928, at p. 970. Thus the U.N.H.C.R. Handbook asserts that serious violations of human rights for one of the reasons enumerated in the definition of refugee would constitute persecution: par. 151. In Oyarzo v. Minister of Employment and Immigration [70] the Federal Court of Appeal of Canada held that on the facts of that case loss of employment because of political activities constituted persecution for the purpose of the definition of Convention refugee in the Immigration Act 1976 Can, s. 2(1). The Court rejected the proposition that persecution required deprivation of liberty [71] . It was correct in doing so, for persecution on account of race, religion and political opinion has historically taken many forms of social, political and economic discrimination. Hence, the denial of access to employment, to the professions and to education or the imposition of restrictions on the freedoms traditionally guaranteed in a democratic society such as freedom of speech, assembly, worship or movement may constitute persecution if imposed for a Convention reason: Goodwin-Gill, pp. 38 et seq. In Reg. v. Immigration Appeal Tribunal; Ex parte Jonah [72] Nolan J., sitting in the Queen's Bench Division, held as a matter of law that there was a well-founded fear of persecution when the adjudicator had found "that if the appellant on his return to Ghana sought to involve himself once again in union affairs, he could be in some jeopardy, but there is no acceptable evidence to indicate that he would be at any material risk if he was to resume his residence in his remote family village where he spent a year and a half immediately prior to coming to this country" [73] . His Lordship held that being "subjected to injurious action and oppression - by reason of his political opinion and membership of a social group opposed to the government" constituted a well-founded fear of being persecuted "in the ordinary meaning of that word" [1] . In the United States, the Ninth Circuit has also taken a liberal view of the term "persecution". In Kovac v. Immigration and Naturalization Service [2] , the Court of Appeals construed the phrase "persecution on account of race, religion, or political opinion" in the Immigration and Nationality Act as meaning "the infliction of suffering or harm upon those who differ (in race, religion, or political opinion) in a way regarded as offensive". This definition of "persecution" was re-affirmed by the Ninth Circuit in Moghanian v. U.S. Department of Justice [3] . In Berdo v. Immigration and Naturalization Service [4] , the Sixth Circuit approved a similar construction.