Brazil’s so-called dirty list, one of the nation’s most powerful weapons against slave labor, is legal and can proceed, the Supreme Court ruled on Monday.

With the ruling, the list of companies and individuals found by labor inspectors to have engaged in slave labor overcame a legal challenge by a Brazilian association of real estate developers.

Companies on the list are barred from receiving state loans, and it is used by private banks to gauge credit risk and by international buyers concerned about their supply chains.