Electric car giant BYD has become the first Chinese business to be raised in the European Parliament over allegations of labor abuses in Hungary, CNBC has learned, following a watchdog’s investigation into working conditions at the site.

Contractors hired to build BYD’s factory in Hungary allegedly kept thousands of employees working seven days a week, with shifts lasting more than 12 hours a day, according to a report published on April 14 by New York-based watchdog China Labor Watch (CLW). The group said it interviewed 50 workers and visited the factory site three times since October 2025.

China Labor Watch, a U.S.-based nonprofit organization that has tracked worker conditions since its founding in 2000, shared the report’s findings with EU government representatives. Earlier this month, three members of the European Parliament formally asked the European Commission about the alleged labor abuses in Hungary.

The allegations by China Labor Watch mark the first time claims of labor abuses linked to a Chinese-owned auto business manufacturing in the European Union have been brought to the attention of the European Commission, according to checks by CNBC. 

In February, a worker reportedly died on-site during a crane operation. Citing conversations with workers, CLW founder Qiang Li told CNBC there had been more deaths on site.

He added that, based on conversations with workers, broader medical support was inadequate as individuals were not always employed on work visas with corresponding medical insurance.

Hungary’s National Ambulance Service told CNBC Thursday that since Feb. 1, emergency medical services were called to the factory site 12 times, with one death. 

The latest allegations come as BYD has expanded into an automotive powerhouse, surpassing Tesla as the world’s largest electric car manufacturer in 2025. BYD is among a wave of Chinese companies expanding overseas, aiming to sell more than a million cars outside China this year as sales in its home market slump.

One contractor named in the report, AIM Construction Hungary, is a subsidiary of Jinjiang Construction Group — the same firm linked to a 2024 scandal at BYD’s factory in Brazil that national labor authorities said, following investigations, involved conditions “analogous to slavery.” 

BYD claimed in December 2024 that it stopped working with Jinjiang Construction’s Brazilian subsidiary in the wake of the scandal. But the CLW report allegations indicate BYD hired another subsidiary of the same Jinjiang group to build the factory in Hungary.  The report said CLW reviewed a sample labor contract for jobs at BYD’s Hungary factory, which included the option of being sent to Brazil and Turkey, where BYD is also building a factory.

AIM Construction Hungary was previously known as China Jinjiang Construction Hungary, according to company records from Hungary’s Ministry of Justice, accessed through an authorized data provider.

BYD and the Jinjiang entities did not respond to CNBC’s requests for comment. Authorities in the EU also did not respond.

The facility in the southern Hungarian city of Szeged is one of five BYD sites in Hungary, where the automaker established its European headquarters nearly a year ago during a visit by chairman Wang Chuanfu.

The EU raised tariffs on China-made electric cars in 2024, in a bid to localize production. But China-made vehicles still climbed to a record 9.3% of new cars sold in the bloc in December, according to Rhodium Group.

BYD is rapidly growing its market share. New BYD cars registered in the EU more than doubled in the first two months of the year to 29,291, exceeding Tesla and gaining 1.8% of the market, according to the European Automobile Manufacturers’ Association.

By model, BYD’s Seal U ranked third in January registrations, behind models from Renault and Skoda, according to European Commission data. More than two-thirds of new passenger cars sold in Europe in January were electric.

Hungary received the bulk of China’s growing automotive investment in Europe over the last three years, according to Rhodium Group data.

BYD’s Szeged factory is slated to produce 300,000 cars per year at full capacity, though the timeline to reach that target is unclear.

As construction of the factory progressed, workers, mostly from China, were allowed to rest only when inclement weather halted work, according to CLW.

Managers “wanted to begin production of cars in January [2026], so they were rushing the project’s timeline — they weren’t letting workers leave,” Li said in Mandarin remarks translated by CNBC.

The Szeged facility manufactures BYD’s Dolphin Surf model, according to a company statement citing BYD Executive Vice President Stella Li. Local media reported in January that trial production had begun.

CLW’s Li said the contractors used a range of financial levers to keep workers on-site. Some were promised free plane tickets home if they worked for more than six months; others had wages withheld until their contracts were fulfilled, or incurred miscellaneous charges such as recruitment fees even before arriving on-site, according to the report.

Employees were directed to tell labor inspectors that they only worked “five days per week, eight hours per day, with one hour of overtime,” the report said. CLW alleged their actual working hours directly violated Hungary’s Labor Code — which limits working hours to eight per day, and no more than 48 hours a week — and that their conditions resemble the International Labor Organization’s definition of forced labor.

When CNBC contacted Hungary’s National Directorate-General for Aliens Policing about the allegations, the government department said it “took the necessary measures within the scope of its authority to conduct examinations of the matters described in the [CLW’s] submissions.”

Luiz Felipe Brandao de Mello, head of Brazil’s agency tasked with enforcing national labor standards, was removed from his post, according to an official government gazette. Reuters reported, citing two sources close to the matter, that de Mello lost his position due to a decision to add BYD to a blacklist restricting its access to loans.

Brazil’s labor ministry had added BYD to the list days earlier — only to have a Brazilian court reverse that decision until a final ruling was made.

Brazil’s national association of labor inspectors did not respond to CNBC’s requests for comment.