Around 300 protesters clashed with the police as anti-austerity groups marched from London's Trafalgar Square to the Houses of Parliament on Saturday.
There were scuffles between activists and police which lead to the arrest of one man and confrontation between the two sides.
The event, organised by The People's Unity Party, is calling for an end to the controversial Bedroom Tax introduced by the coalition government, the return of VAT to 17.5% and for cuts to national services to end immediately.
Similar protests were also organised in Edinburgh, Scotland and Cardiff, Wales.
Activists say that measures like the Bedroom Tax and tax breaks for corporations and banks harm the 99% of the population. The austerity reform introduced by the government will take £2.3 billion out of the pockets of Britain's poorest households.