Halina Birenbaum, an 89-year-old poet who was born in Poland and lives in Israel, said in a statement: “This is more proof for me that evil will not win.”
Altaforte Edizioni, founded and run by far-right activist Francesco Polacchi, had been due to present its books at the prestigious event.
But when the fair began, its stand had been dismantled at the request of local authorities, officials said.
The ban followed a protest by Birenbaum, the Auschwitz-Birkenau Holocaust museum and Italian intellectuals.
“We consider our presence incompatible with that of a neo-fascist publishing house that openly spreads a revisionist culture,” read a letter signed by the group.
Polacchi is a self-proclaimed fascist who has openly praised Italian dictator Benito Mussolini.
He has also been cited declaring that “anti-fascism is the true evil in this country”.
In light of his publishing house’s ban from the fair, Polacchi said he would sue, calling the move an attack on Italy’s far-right League leader, Matteo Salvini, who serves as deputy prime minister and interior minister.
Altaforte is publishing a book of interviews with Salvini that was to be presented at the fair.
Salvini also denounced the ban on Altaforte, saying there is a “minority on the left that claims the right to decide who can make music, who can do theater, who can publish books”.
“We are in 2019 and we are censoring books based on ideas ... ideas are answered with other ideas, not censorship,” Salvini told a political rally in the city of Pesaro.
Italian President Sergio Mattarella sent a message to organisers of the fair, saying that the values of Auschwitz survivor and writer Primo Levi, who was born in Turin, should “constitute the fundamental basis for a peaceful society and a respectful social coexistence”.
The Turin International Book Fair runs from May 9 to 13.
