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By Phil Mercer
BBC News, Sydney
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Opposition to the laws prompted a huge rally last November
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Tens of thousands of demonstrators have turned out in cities across Australia to protest against new industrial laws.
Central Melbourne was brought to a standstill by an army of demonstrators, including teachers, police officers, nurses and construction workers.
Trade unions have insisted that the new industrial laws will erode the rights of workers.
The conservative government in Canberra has repeatedly stressed that the new legislation will boost the economy.
Critics say the new laws are the biggest attack on employees' rights for generations.
They are worried that wages and job security will suffer.
The legislation aims to reduce the power of trade unions in favour of individual contracts. The leader of the opposition, Kim Beazley, told protestors in Melbourne that if he wins the next election, the changes will be scrapped.
"When we get into office in 18 months' time, we will rip up these laws. And then we are going to put in place laws based on true Australian values that make sure that Australian families can support themselves in their aspirations," he said.
Australia's conservative government has insisted these reforms will bring much needed flexibility into the work place and will create thousands of jobs.
Ministers have argued that the changes, which were introduced at the end of March, are necessary to ensure that economic growth continues.
Some employers' groups have criticised this national day of action for disrupting productivity.