Twenty people in France and Switzerland are under arrest on suspicion of laundering 40 million euros of drug money.
They include the deputy mayor of a Paris district. Florence Lamblin resigned from her post in the 13th Arrondissement on Saturday but denied any involvement.
She was one of nine suspects charged with offences ranging from money laundering to drug trafficking.
The BBC reports the arrests were part of an investigation into the smuggling of cannabis from Morocco to Paris.
Around 400,000 euros in cash was found by police during house searches and the rest was uncovered in safety deposit boxes and bank accounts.
In total, 17 people were arrested in France and three in Switzerland.
Eight suspects were freed on bail and the ninth was kept in custody.
