The pre-Brazil tension has triggered a wave of violent attacks, including a case that is being treated as a political murder.
A woman has carved a swastika into her flesh from local supporters of the president's extreme right-wing presidential candidate, Jair Bolsonaro.
An imminent runoff between Bolsonaro and left Fernando Haddad polarizes the nation.
Bolsonaro dismissed the violent attacks as isolated.
The news agency AFP reported several cases of violent violence. Particularly affected were followers of Mr. Haddad.
The Brazilian Association of Investigative Journalism (Abraji) has also registered more than 60 physical attacks on reporters, which took place "in a political, partisan and selective context".
- Who is Jair Bolsonaro?
- Who is? Fernando Haddad?
Mr. Bolsonaro runs on a platform where not only crime can be fought, but his critics also say that his language ̵
He denied this. "I ask people to stop, but I do not control them," he said. "If a guy wearing one of my T-shirts goes too far, what can I do?"
He said violent attacks had come from the other side as well. He was stabbed at a rally in September and spent time in intensive care.
Who was attacked?
Romualdo Rosário da Costa, a 63-year-old master of Brazilian martial arts Capoeira, was stabbed in the early hours of Monday after the first round in a bar in the northeastern city of Salvador.
The attacker, Paulo Sérgio Ferreira de Santana, told police that his motivation was political. He was furious when Da Costa said he was supporting Mr. Bolsonaro's rival, and reportedly went home to pick up a knife, and then returned to the bar to stab the victim 12 times.
The swastika attack was also on Monday. A gang of men attacked a 19-year-old woman in the southern state of Porto Alegre and used a penknife to draw the symbol on her skin.
The woman – who was not named – was wearing a LGBT flag and an anti-Bolsonaro sticker, according to Globo News.
Mr. Bolsonaro is known for his homophobic comments, including that he prefers to have a dead son rather than a gay son.
Trans singer Julyanna Barbosa was attacked last Saturday in Nova Iguaçu in the state of Rio de Janeiro. She said that her attackers were screaming about her support for Mr. Bolsonaro and saying, "These garbage people must die."
The Guardian reports that football fans chant: "Bolsonaro will kill all gays."
How violent is Brazil?
The violence has been increasing in the country for some time and was a focus of the election campaign.
Analysts say voters turned to Mr. Bolsonaro for this.
- Why are there so many murders in Brazil?
The gay rights organization Grupo Gay da Bahia said 2017 was the deadliest year for the country's LGBT community with 387 killings.
It is feared that this number could continue to rise this year as more than 300 people have been killed in anti-LGBT hate crimes so far.
Does Mr. Bolsonaro promote violence?
The law-and-order rhetoric of the former army captain appeals to supporters, but his critics fear that this will create more problems.
He said the police were allowed to kill criminals more freely with later questions. Those who kill "10, 15 or 20" should get a medal, he said in August.
He also wants to relax the gun laws for the citizens. In the past he said that during the dictatorship of the country (1964-1985) more people should have been killed.
In response to recent political violence, Mr. Haddad said, "We have to sit with the people without guns on our hips."
Mr Bolonaro said he had refused to become a "peace and love" character to win votes.
Where is it from here?
Polls indicate that Bolsonaro will be elected president after the runoff election on October 28.
According to recent estimates by pollster Datafolha, Mr. Bolsonaro is 58%, Mr. Haddad 42%.
Haddad's party, the Labor Party, is unpopular with many voters after a number of its politicians have been involved in a corruption scandal.
The human rights group Conectas Derechos Humanos says that the candidates "must ask their constituents in a peaceful and tolerant manner."