Despite the arrests and forced evictions of scores of Occupy protesters at the weekend, anti-capitalist demonstrators across the country are refusing to give up what they say is their fight against corporate greed.

About 80 people from the Occupy Sydney movement were removed from Martin Place yesterday when about 100 police swooped on the square during dawn raids, ending a week-long protest.

On Friday, violence erupted during the Occupy Melbourne protests when about 400 police evicted demonstrators who had been camping in the city square for nearly a week.

And activists in Perth now say they are nervous ahead of similar protests planned for the centre of the city to coincide with the CHOGM meeting on Friday, which Prime Minister Julia Gillard will attend.

Victoria's Police Minister was forced to defend the behaviour of officers after demonstrators called for the state's ombudsman to investigate 43 alleged cases of police violence on Friday, including eye-gouging, punching and the use of pepper spray on children.

Occupy Melbourne member Ben Convey says the actions of police over the weekend were "disgusting" but insists protesters will not be silenced.

"Some of the hundreds of people that were gathered in the [Melbourne] city square ... confronted this issue of what will we do if the Victorian police try to evict us," he told ABC Radio National's Breakfast program.

"All the people in that group decided if that was to happen, we would defend the space and defend what we thought was a wonderful thing that we created in the middle of our city."

But he says there have been some "birthing pains" along the way.

"Because this is an emergent movement and because it's an experiment, people are still testing it out and working out how to do it," he said.

"I believe that some of those people that were playing a media spokesperson or police liaison role may have at certain times said things that may not have been reflective of the democratic process that we are all experimenting [with]."

Sydney's Occupy protest group says further anti-corporate greed rallies are planned, but not in the form of a sit-in.

Protestor Elsie Kennedy says protesters will no longer be occupying Martin Place around the clock.

"We want to strengthen our movement, we want to take the time to do outreach to the suburbs, do outreach to unions, do outreach to other organisations," she said.

Australia's Occupy protests started last week as part of the worldwide movement which began in New York against what protesters describe as corporate greed.

An Occupy Melbourne protester is removed by police at City Square in Melbourne on October 21, 2011. ( AAP: Julian Smith )

Backlash continues

The Victorian and New South Wales governments have praised the actions of police, despite some protesters describing the use of force as excessive.

Victorian Premier Ted Bailleiu said police only stepped in on Friday when demonstrators in Melbourne refused to honour a promise to disperse peacefully.

Police Minister Peter Ryan has backed the Premier's comments, saying police acted appropriately.

"I thought they were magnificent. I thought they were professional," he said.

"I thought that they conducted themselves very responsibly and having been warned to leave the location, these people, having indicated earlier in the week that they would go peacefully, that circumstance we witnessed should have happened, I think is entirely on their head."

New South Wales police and the State Government defended the use of force, but protester Susan Price maintains the police actions were over the top.

"I personally witnessed protesters who had the knees of police officers pushed into their necks and their faces were on the ground ... their noses were bloodied," she said.

Lord Mayor Clover Moore said she was "concerned" about reports of violence from police as well as protesters.

Meanwhile, West Australian Premier Colin Barnett has issued a warning to Perth protesters, despite their intention to peacefully camp in the centre of the city.

Occupy Perth says it will join forces with a group planning a protest march on CHOGM next Friday, but events in Melbourne and Sydney have left organisers apprehensive about the response they will attract from authorities.

"It's a really good time to be doing it because how often does Perth have a meeting like CHOGM," organiser Luke Skinner said.