Protesters stormed the Paris headquarters of luxury giant LVMH as France saw a new round of demonstrations over government plans to raise the retirement age from 62 to 64.
"If Macron wants to find money to fund the pension system, he has to come here to find it," said Fabien Villedieu, a trade union leader, to CNN.
The protests came on a day when shares in LVMH - which owns brands such as Louis Vuitton and Moët - jumped to a record high.
Paris police chief Laurent Nunez warned in advance that protesters could “struck, often against what they see as capitalist signs", speaking on French radio RMC.
Up to 600,000 people are expected to take to the streets across France on Thursday against pension reforms in the latest protests, which come a day before a crucial court ruling on the constitutionality of the divisive law.
French President Emmanuel Macron argues that reforms are essential to rein in public finances and has remained steadfast, this week saying that “the country must continue to move forward".
Speaking at an incinerator picket line near Paris on Thursday morning, Sophie Binet, the new president of the GGT, one of France's main trade unions, insisted: "As long as the pension reform is not withdrawn, the mobilization will continue in a way or in another. "
Paris Mayor Anne Hidalgo expressed her support for the demonstrators ahead of the new round of protests.
"On the eve of the decision of the constitutional council, I am once again supporting the mobilizations in Paris and everywhere in France", Hidalgo wrote on Twitter.
"This reform is unjust and violent. The French have been asking for his withdrawal for months, the government should listen to them." she wrote.
Friday's decision will be decisive if the protests continue. The CFDT, France's other main union, has been more amenable to a negotiated solution.
Garbage, meanwhile, is set to once again fill the streets of Paris as collectors and incinerator workers are on strike again, according to the CGT union.
This will be a continuous strike, the general secretary of the CGT union branch confirmed in a letter to the mayor of Paris.
The previous nearly month-long strike, by the end of March, had seen 10,000 tonnes of rubbish pile up across the capital at its worst.
