Former PM Tony Blair should be in jail, not accruing ever more financial interests, the Stop the War Coalition has stated.
The comment came as Mr Blair was reported to have established an investment bank for the super-rich as part of his seemingly ever-expanding business and property portfolio.
Since leaving office in 2007 Mr Blair has amassed a personal fortune in excess of Â£20 million and set up a host of business ventures as well as receiving large sums from paid consultancies, lecture tours and his generous pension package.
The Sunday Times reported that one of Mr Blair's numerous companies, Firerush Ventures No 3, had been registered with the Financial Services Agency.
It will trade under the name Tony Blair Associates and be able to arrange deals and investments for clients.
Mr Blair has been appointed in lucrative advisory capacities to both JP Morgan and Zurich Financial Services and also receives an annual pension of Â£63,468 and an additional allowance of Â£84,000 to run a private office.
Last week the former PM announced he was to donate the advance for his memoirs, believed to be in the region of Â£5m, to the Royal British Legion.
But anti-war campaigners have seen the donation as an attempt to absolve himself from war crimes committed by his administration.
The Stop the War Coalition has announced it will protest outside a book signing for Mr Blair's memoirs at Waterstones in Piccadilly on September 8.
Speaking to the Star on Sunday a coalition spokesman said: "He should be prosecuted for war crimes and should not be benefiting from the illegal war in Iraq.
"Some estimates say he will make Â£60 million from the war directly, through his work with JP Morgan and others."