Gigantes was born in Yarmouth, Nova Scotia and raised in Aylmer, Quebec. Her father, Earle Peach, was an author who wrote a book called "Memories of a Cape Breton childhood". She earned a Bachelor of Arts degree from Carleton University. She worked as a radio and television broadcaster before entering political life, and was for a time an interviewer with the Canadian Broadcasting Corporation, and host of her own current affairs show in Ottawa. During her time out of political office, she was a member of a City of Ottawa Municipal Energy Planning Project, and served as a representative on women's issues for the National Union of Provincial Government Employees. Gigantes has a daughter, Clea, from a first marriage and a son, Matthew, with her second husband, John Sifton.
Gigantes ran for the Ontario legislature in a by-election held on 7 November 1974. She was defeated by Progressive ConservativePaul Frederick Taylor in the Ottawa area riding of Carleton East, losing by 240 votes. The following year, however, she defeated Taylor by 281 votes in the provincial election of 1975. During her first term she was the NDP's critic for energy and later, education. In the provincial election of 1977 Gigantes was re-elected over Progressive Conservative Darwin Kealey by 781 votes. In the summer of 1980, Gigantes gave birth to her first child. The birth was a first for an Ontario MPP. She said the baby was conceived during an NDP convention the previous fall. She quipped, "It was one of the most positive products of the convention." In the 1981 provincial election she finished third behind both LiberalBernard Grandmaitre and the winner, Progressive Conservative Bob MacQuarrie.
Gigantes returned to the legislature through a by-election win in Ottawa Centre on 13 December 1984, called after Cassidy resigned as MPP. She defeated Progressive Conservative candidate Graham Bird by 1,878 votes. The Liberal candidate, radio call-in show host Lowell Green came in third. Gigantes was re-elected over Bird by an increased margin in the 1985 provincial election. After the 1985 election, the Liberal Party under David Peterson was able to form a minority administration with support from the NDP. Gigantes served as her party's critic for the Attorney General and for Women's Issues in this period. In November 1986, Gigantes proposed a gay rights amendment to a bill that sought to bring Ontario statutes into line with the new Canadian Charter of Rights and Freedoms. Her amendment proposed to protect gays from being discriminated against based on their sexual orientation. The bill, including her contentious amendment, was passed a month later by a vote of 64-45. At the same time during debate on another bill about pay equity, Gigantes was expelled from the legislature for calling Attorney General Ian Scott a liar. The Liberals won a majority government in the 1987 provincial election, and Gigantes lost her seat to Liberal Richard Patten by 1,087 votes. Between 1987 and 1990 she worked as a union representative for the National Union of Provincial Government Employees.
In government
The NDP won a majority government under Bob Rae in the 1990 provincial election, and Gigantes, once again campaigning in Ottawa Centre, defeated Patten by almost 3,000 votes. Gigantes remarked during the election campaign that the Liberals, who were widely seen as leading in the polls, were not in control of events. She said, "The election call has triggered a very cold look at the record of this government and people don't like what they see." As a result of her legislative experience, she was appointed to Rae's first cabinet as Minister of Health on October 1, 1990. In June 1990, the federal government narrowly passed bill C-43 that would have placed restrictions on doctors who performed abortions. In response to the bill, many Ontario doctors decided to stop performing abortions altogether. In November 1990, Gigantes announced that the province would set up fully funded free-standing abortion clinics to ensure that abortion services remained available. In January 1991, Gigantes and fellow cabinet minister Anne Swarbrick led a delegation that appeared before the legal affairs committee of the Senate of Canada that was discussing the bill. Eventually the bill was defeated on a tie vote in the Senate and the federal government never reintroduced the legislation. On April 19, 1991, Gigantes resigned from cabinet after inadvertently revealing the name of a Toronto man who had been sent to the United States for drug treatment that wasn't offered in the province. Three months later, she was reinstated to cabinet as Minister of Housing. During her time as housing minister, Gigantes proposed that apartments within houses, referred to as "granny-flats", would be legalized and protected. The legislation eventually called the "Residents' Rights Act" was passed into law in the summer of 1994. The bill removed the ability of municipalities to ban so-called basement apartments and sought to improve the safety of tenants by giving them the ability to complain about landlords. In August 1994, Gigantes resigned from cabinet when she was found in breach of conflict-of-interest guidelines. Gigantes resigned because she allegedly pressured an Ottawa tenant to drop charges against the board members of her public housing project. The committee found that the breach was minor but had "the potential to diminish the public's trust." The NDP were defeated in the 1995 provincial election, and Gigantes again lost the Ottawa Centre riding to Richard Patten by over 1,500 votes.
Cabinet posts
Later life
In 2004, she co-chaired a candidate search committee for the federal New Democratic Party.
