Italy’s Competition Authority opened an investigation into some companies controlled by luxury fashion groups Giorgio Armani SpA and LVMH’s Christian Dior over alleged unfair commercial practices.

The antitrust regulator said that the two brands may have used supplies from laboratories which employed workers receiving “inadequate” wages. In addition, these workers sometimes had to work illegally long hours in inadequate health and safety conditions, which was “in contrast to the boasted levels of production excellence” at the brands, the regulator said in a statement Wednesday.

It is the latest move by authorities in Italy to crack down on alleged unlawful business conduct in the fashion industry.

In June, a Milan court put a unit of the French fashion house Dior under judicial control citing alleged labour violations in its supply chain. Dior, which produces luxury bags and accessories in Italy, didn’t “prevent and stem labour exploitation within its production cycle,” the Italian police said at the time.

Similarly, in April a Milan judge placed the manufacturing unit of Armani under the same control for alleged workers exploitation.

On Tuesday, financial police and antitrust officials searched the headquarters of Giorgio Armani SpA, G.A. Operations SpA and Christian Dior Italia, according to the statement.

Armani Group said it was aware of the investigation.

“The companies involved are fully committed to co-operate with the authorities, believe that the allegations have no merit and are confident of a positive result following the investigation,” the Italian company added in a written statement.

Dior couldn’t immediately be reached for comment.

By Alberto Brambilla

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Italian Sweatshop Probe Is a Wake Up Call for Luxury Brands

An investigation into labour exploitation in fashion’s Italian supply chains has already entangled Armani and LVMH, accusing the companies of failing to adequately oversee their suppliers. Incoming EU regulation means such lapses in oversight could soon come with penalties of up to five percent of global revenue.