Goldman Sachs could face a strike by cleaners, who say they are overworked even as the firm sees huge profits and its bankers earn massive bonuses.
Goldman Sachs has seen profits soar recently
Some 120 cleaners employed by Mitie, a contractor, say their numbers have been cut but their workload has not.
They staged a picket outside Goldman Sachs in London on Wednesday, said the Transport & General Workers' Union.
The protest comes a day after Goldman Sachs saw fourth quarter profits leap by 93% to a record $3.15bn (£1.6bn).
These figures brought annual earnings to $9.54bn.
"A staggering $8.4bn (£4.2bn) will be set aside for salaries, bonuses and benefits," said the union.
The picket that took place outside the firm's offices included banners saying "Goldman Sucks" and "Justice for Cleaners" said a T&G representative.
The T&G Union has been supporting a wider Justice for Cleaners campaign to give every cleaner in the City of London a decent wage, sick pay, a pension, 20 days' holiday and bank holidays, as well as collective bargaining through the union.
The bank meanwhile says: "We support responsible union representation and the right for people to earn a living wage."
A ballot would be needed for a strike to go ahead and no industrial action is expected until the New Year, said the T&G.
"Whilst bankers at Goldman Sachs will be splashing out on second homes, cars and polo ponies with their multi-million pound bonuses, cleaners at Goldman Sachs are being squeezed by staff cutbacks," said Tony Woodley T&G general secretary.
"The lack of cover means the cleaners are overstretched, which makes an already difficult job even more stressful."