Brazil’s Supreme Court ruled on Thursday that corruption cases involving illegal campaign donations should be handled by electoral courts, a move that some prosecutors warned could hurt their groundbreaking crusade against graft.

Six justices on the nation’s top court cast votes in favour of sending to electoral courts all cases involving politicians who use money gained through corruption or money laundering for campaigns, rather than having them heard by federal criminal courts. Five justices opposed the decision.

Prominent federal prosecutors warned that could unwind the five years of work carried out during the landmark “Car Wash” corruption investigation, which has sent scores of powerful politicians and businessmen to jail in the world’s biggest graft probe of its kind.

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