The man behind Sydney's siege, Man Haron Monis, expressed outrage about Prime Minister Tony Abbott's "Team Australia" comments in a series of online tirades and has a long history of directing hatred at senior politicians.

Most notorious for sending abusive letters to the families of Australian soldiers who were killed in Afghanistan, Monis also has a lengthy track record of attacking politicians on social media, including Mr Abbott and his predecessor Kevin Rudd.

In extensive posts, he has claimed to be under "constant attack" by the Australian government and has compared himself to Wikileaks founder Julian Assange, saying false charges, including sexual assault, have been made against him for "political reasons".

Man Haron Monis outside a Sydney court in February 2010. Photo: Kate Geraghty

Just last week Monis – who had more than 14,000 "likes" on social networking site Facebook - branded Australians who supported the United States and its foreign policy "racist and terrorist" on his Facebook page, which late on Monday night was taken down.

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"Shame on Team Australia and shame on those racist and terrorist Australians who support the governments of America and its allies including Australia."

The Facebook page bills itself as a "counter terrorism" page and states "it is 'Team Islam' against Australian oppression and terrorism."

He went on to congratulate Muslims who had "chosen 'Team Islam'".

In a letter to Mr Abbott on November 1, 2013, Monis wrote – in what can now be seen as a chilling portent of Monday's siege - attacked the Prime Minister for declaring Australia's mission to Afghanistan over during a visit to Tarin Kowt military base.

Monis argued that Australia's policy in Afghanistan "has a significant role in jeopardising security and peace in the world especially in Australia", challenged the Prime Minister to a debate about the Afghan war and promised to support government policy if he lost the debate.

"However, if it is proven in our debate that the government's policy endangered Australia, if it is proven the government made Australia unsafe, if it is proven that Australia and Australians will be attacked, in that case I expect you to change the Australia's (sic) policy."

Monis last week praised the Islamic State group for its provision of services in Syria and Iraq – though most experts say that such services are largely used for propaganda and in fact the group predominantly terrorises local populations.

He has also claimed to be one of the "victims and witnesses of the torture by the barbaric and terrorist Australian authorities".

And Monis has also attacked former Prime Minister Kevin Rudd, including after Mr Rudd criticised the self-styled preacher over the letters he sent to dead soldiers' families.

Mr Rudd said at the time: "I think people … I think their stomachs turn."

Mr Rudd vowed to review Australia's immigration laws after Iranian-born Monis – who arrived in Australia in 1996 as a refugee - was charged with seven counts of harassment over the letters to soldiers' families.

As recently as December 5, Monis was still fulminating on Facebook about Mr Rudd's comments, insisting it was up to God as to whether he would be deported from Australia.