By Gary Duffy BBC News, Sao Paulo

One month to the day after the crash at Sao Paulo's Congonhas airport, in which almost 200 people died, protesters are taking to the streets showing their anger about a range of issues in Brazilian society.

Television celebrities have appeared in ads backing the protest

Taking as their slogan "Cansei", meaning I am tired or fed up, they will voice their discontent at everything from corruption to the apparently endless ability of those with money in Brazil to evade punishment - known here as "impunidade" or impunity.

The protest, which will include a minute's silence, has been organised by the Sao Paulo branch of the Organisation of Brazilian Lawyers (OAB-SP), and is backed by several TV personalities and business leaders.

The grouping, known broadly as the Civic Movement for the Rights of Brazilians, has to some extent tapped into a mood of anger following July's crash, the worst air disaster in the country's history.

But even before the protest gets under way, it has provoked controversy, with allegations that the protest is unrepresentative of Brazilian society.

Unconcerned, (the protesters) walk around favelas or shanty towns in a city that displays the biggest fleet of helicopters in the world Mino Carta Journalist

Critics say "Cansei" is symbolic of discontent among Brazil's elite and wealthier parts of the country, and is a partisan cover for attacking the government of President Luiz Inacio Lula da Silva.

It has failed to capture the wider public imagination, they say.

The same allegation is levelled against those who have booed the president at a number of events recently, including, embarrassingly, the opening ceremony of the Pan American games in Rio de Janeiro.

Scathing comments

Lula's supporters say there is nothing to suggest widespread anger directed towards his administration.

Despite discontent over the problems in the air industry for example, opinion polls suggest the government continues to enjoy high levels of support.

Violence is part of daily life for many of Brazil's poorest people

The same polls did show, however, that only a minority of Brazilians use air travel on regular basis.

Journalist Mino Carta has made some scathing observations about the movement.

"I am very excited by the movement "Cansei", which intends to expose the Brazilian resentment over the air crisis, the violence and other Brazilian problems," he wrote in his blog.

"Oh, the resentment of the big shots. They didn't resent the creation of a state that intended to be liberal without being that, and the construction of democracy without the people.

"They didn't resent the fact that only 5% of Brazilians earn more than 800 reais ($376, �190 a month). Unconcerned, they walk around favelas or shanty towns in a city that displays the biggest fleet of helicopters in the world."

But those behind the protest insist they are a non-partisan organisation demanding accountability over corruption and poor government in Brazilian society, wherever it is found and regardless of which party is involved.

This is not an elite, it is a movement of the people Luiz Flavio Borges D'Urso OAB-SP head

They say they aim to stir wider society out of the complacency that exists over the relentless scandals and failings in public life that fill the newspapers and TV bulletins, and over the continuing violence.

The protest takes place as emotions continue to run high in the wake of the crash at Congonhas airport.

Indignation

For some, the protest is just a telling example of an existing gulf in attitudes in Brazilian society between the haves and the have-nots that is only getting bigger.

But Luiz Flavio Borges D'Urso, president of the Sao Paulo branch of the Organisation of Brazilian Lawyers is dismissive of suggestions that "Cansei" represents the elite.

"This is a great nonsense," he told the BBC News website. "This is just another way of trying to disqualify the movement.

"The legal profession is not an elite. They are liberal professionals and workers. We have engineers, computer experts, students and businessmen. When I say businessmen, there are some from major companies, but there are others who own bakeries and run small businesses.

President Lula announced a series of measures after the crash

"This is not an elite, it is a movement of the people."

He dismisses claims that the movement is linked to an opposition party, the PSDB, or that it is campaigning against the government of President Lula.

The minute of silence will be a tribute to the dead in recent air crashes and the victims of violence in Brazil, but will also reflect a wider indignation over a range of issues, he says.

"These problems are represented in the message of our campaign - I am fed up with corruption, fed up with air chaos, fed up with the amount of tax, fed up of stray bullets (that kill innocent people), fed up of children being abandoned in the streets. Fed up with a whole series of problems that Brazil is confronting and which need action by society," he said.