Days after her cabinet colleague and senior TMC leader Partha Chatterjee was arrested by the Enforcement Directorate (ED) in connection with a school recruitment scam, Bengal Chief Minister Mamata Banerjee on Wednesday slammed the media for launching a "malicious campaign" against her party. Banerjee also asserted that anyone was proven guilty by the court must be punished but probe “agencies must not be used to malign political parties”.