Occupy London will stage a series of mock trials of politicians and banks in the coming weeks after occupying Old Street Magistrates Court this week.
A retired judge, along with solicitors and barristers, will oversee proceedings in the Grade II listed building that has lain empty for the past 15 years, according to those behind the action.
Activists are currently cleaning and tidying up the building, but have already assigned the basement cells to those they intend to prosecute.
They include Tony Blair, George Bush, Boris Johnson, Merryl Lynch, Goldman Sachs and the Corporation of London.
The courthouse is the fourth space the London occupy movement have taken over, the others being St Pauls, Finsbury Square, in City Road, and the UBS building, in nearby Sun Street, which they have renamed Bank of Ideas.
Several court cases initiated by UBS and the City of London Corporation are ongoing in a bid to evict the activists.