Dominique Strauss-Kahn, the former managing director of the International Monetary Fund, was released on bail on Monday after he was charged with involvement in a prostitution ring in Lille. The filing of the preliminary charges allows for further investigation. His lawyer, Richard Malka, has argued that Mr. Strauss-Kahn did not know that the women in question were prostitutes hired by his hosts, including for evenings in Washington and Paris, and that he did not pay them. His lawyers will also be in court on Wednesday in New York for the first hearing in a civil case brought against him by Nafissatou Diallo, a hotel housekeeper who has accused him of sexually assaulting her.