Thousands of people are expected to rally across the country at counter-protests against anti-immigration demonstrations.

Unite Against Racism: Migrants and Refugees Are Welcome events will be held on Sunday in Sydney, Melbourne, Canberra, Brisbane, Perth and Adelaide.

Organisers say the March for Australia rallies, which are also being held in most capital cities about the same time, are racist, with Nazis involved in some events.

"The far right is organised, violent and on the march," Greens senator Mehreen Faruqi said.

"Yet political leaders refuse to grapple with the reality of white supremacy and racism that is threatening and harming First Nations people and people of colour every day."

A collection of unions and community groups has organised the counter-protest.

"The danger p

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