Guwahati, April 2: The Assam Pradesh Congress Committee (APCC) staged a dhar in front of the Raj Bhawan, Guwahati on Monday alleging dilution of the Scheduled Caste and Tribes (Prevention of Atrocities) Act, 1989, mainly due to disinterested and casual approach by the Centre in the Supreme Court recently in a case that attracted relevant sections of the said Act.