By 1935, he was sufficiently troubled by Nazi Germany to end his career as a singer and returned to working as a rabbi. In 1945, he was the inspiration behind a legal challenge to the "restrictive covenants" that forbade the selling or renting of property to Jews by supporting the
Re Drummond Wren case. In a calculated risk, a Jewish group, the Workers' Education Association (WEA) had purchased a property in Toronto known to have a "restrictive covenant" in order to build a home for veterans of World War Two. Only after construction was well under way was it announced that the property had a "restrictive covenant" and was thus illegal as the WEA was a Jewish group. The historian Philip Giarad observed the Drummond Wren case appeared to have been a set-up as the WEA should have known the property had a "restrictive covenant", and the case appears to have been launched to take advantage of a moment when public opinion was much more sympathetic towards Jews. In April–May 1945, the last of the death camps and concentration camps of Nazi Germany had been liberated, and newsreel footage of emaciated Holocaust survivors had suddenly made antisemitism unfashionable. On 31 October 1945, Justice
John Keiller MacKay ruled against the "restrictive covenant" laws as a violation of the law in the Drummond Wren case. In a pamphlet he printed praising MacKay's ruling, Feinberg wrote: "It clothes in concrete reality, for specific cases, the universally acclaimed principles for which World World Two was pursued to a victorious end". In February 1947, Feinberg was part of a
Canadian Jewish Congress (CJC) delegation who met Social Credit Party leaders in Ottawa to ask them to purge their party of its vocal anti-Semitic wing. In the aftermath of the Holocaust, there was a "Never Again!" attitude in the Canadian Jewish community and there was a feeling that antisemitism must not be tolerated in any form. At the meeting in Ottawa, the CJC delegation complained that the Social Credit French language newspaper
Vers Demain had been printing extracts from
The Protocols of the Learned Elders of Zion and in general the newspaper was very hostile towards Jews. The meeting did not yield positive results. Feinberg attended later in 1947 a meeting of the CJC leaders that concluded that the Social Credit movement, whose support was mostly found in western Canada and in Quebec, was the most dangerous anti-Semitic movement in Canada, and the CJC should do everything within its power to discredit Social Credit. At the same summit of the CJC leaders, Feinberg argued that all racism must be fought, not just antisemitism, saying: "The French-speaking Catholic in Ontario, the Japanese deportee from British Columbia, the Negro economic pariah are no less a Jewish obligation than we are a moral crisis for the Christian". At a meeting in late 1947, Charles Daley, the Ontario minister of labour dismissively told Feinberg "that these days, racial discrimination is to a great extent imaginary". A supporter of
Zionism, when on 6 December 1947, the United Nations declared that the Palestine Mandate would be partitioned into an Arab state and a Jewish state, Feinberg put on a pageant at Holy Blossom starring the children of his congregation in celebration. The pageant portrayed "2, 000 years of pogroms, antisemitism and travails", ending in with Israel being declared. Concerned that the Jews might be accused of having dual loyalties, at the same time Feinberg told the
Globe & Mail: "Palestine has always been the center of our pristine Jewish culture and faith and the shrine of our sacred memory. Canada, however, remains the soil on which young Canadian Jewry has been born". In 1948, Feinberg attended a conference of the
World Jewish Congress in
Paris, where he criticized Canadian immigration law for excluding Jewish nurses and domestic workers from coming to Canada. In a sermon, Feinberg stated: "
Little Black Sambo in the public schools encouraged race prejudice by creating a pattern of Negro minstrel show comicality in the minds of white children, and by arousing a sense of persecution and emotional insecurity in colored children. Neither potential arrogance nor an inferiority complex is a proper seed-bed for Canadian citizenship." Feinberg continued to be a supporter of Zionism, and engaged in debates with the United Church of Canada over the issue. After the
Observer, the journal of the United Church, had published a pro-Palestinian article by Claris Silcox saying the establishment of Israel in 1948 had been an outrage, Feinberg asked for and was allowed to publish a rebuttal article in the next edition of the
Observer. In his article, Feinberg wrote the "recreation of a sovereign secure homeland in Palestine for the Jews...has been since the dispersion an inextricable part of a sacred Messianic hope at the core of Judaism". Feinberg observed that it was President
Gamal Abdel Nasser of Egypt who was threatening in his speeches to wipe Israel off the face of the world while the Israeli Prime Minister
David Ben-Gurion was making no such threats about Egypt. Feinberg accused Nasser of having "Hitler-like dreams" about Jews. He wrote that he felt sad about the suffering of the Palestinian refugees, but he also stated that there were hundreds of thousands of Jewish refugees who were expelled or fled from Arab nations such as Egypt, Iraq, and Yemen living in Israel, which did not excite the passion of the
Observer in same way that Palestinian refugees did. Feinberg concluded the best solution to the Israeli–Palestinian dispute would be an inter-faith dialogue about the status of the Holy Land between Christian, Jewish and Muslim religious leaders. In 1957, Feinberg became the first rabbi to receive an honorary degree from the
University of Toronto. Feinberg also protested against the nuclear arms race of the Cold War, and became president of the Toronto Committee for Disarmament. A colorful character, Feinberg's liberal views on social issues such as legalizing abortion and a frank acceptance of human sexuality as normal made him very controversial. His activism led the Canadian government to regard him as a trouble-maker and during his time as rabbi of Holy Blossom from 1943 to 1961, he was spied upon by the
Royal Canadian Mounted Police (RCMP) as a "subversive". ==The Singing Rabbi==