Chennai, April 16: The DMK, along with other opposition parties, staged a protest here on Monday against the dilution of the Scheduled Castes and Scheduled Tribes (Prevention of Atrocities) Act. Addressing the gathering, DMK leader M.K. Stalin said the Supreme Court order to dilute the Act was unacceptable. Stalin demanded the Central government to file an appeal in the Supreme Court and also include the Act under the Ninth Schedule of the Constitution. The political parties that participated in the protest were DMK, Congress, IUML, MDMK, VCK and MMK.