Protesters have targeted Arcadia and former BHS boss Sir Philip Green in a campaign over the Living Wage.
Demonstrators disrupted the flagship Topshop store on Oxford Street on Saturday, bringing traffic to a standstill on the busy central London street.
More than 100 protesters took part in the demonstration which moved down to another Topshop store towards Marble Arch and which was forced to close its doors briefly.
Labour MP and shadow chancellor John McDonnell was among the demonstrators.
— United Voices of the World (@UVWunion) May 14, 2016
Activists shouted "Topshop shame on you" while police blocked entry to the store and there were some scuffles with police.
A member of one trade union group involved in the protest, Teresa Grey of United Voices Of The World, said two Topshop cleaners had joined the group and one had been sacked while the other was suspended.
— IWGB Couriers (@IWGB_CLB) May 14, 2016
— Susan Dalgety (@DalgetySusan) May 14, 2016
Sir Philip Green has faced intense scrutiny in recent weeks over his sale of BHS which recently collapsed into administration.