1. Heard Mr. P.K. Tiwari, learned counsel appearing for the petitioners, Mr. A.M. Buzarbaruah, learned Government Advocate appearing for the State of Arunachal Pradesh, Mr. D.Barua, learned Standing Counsel appearing for the Election Commission of India and Mr. U.Dutta, learned counsel appearing for the respondent No.5.

2. The main grievance raised in the present Public Interest Litigation relates to the additional guidelines issued by the Election Commission of India in 2005 and 2007 for revision of Electoral Rolls in respect of areas where there are substantial presence of Chakmas and Hajongs, namely, 14-Doimukh (ST), 46-Chowkham (ST), 49-Bordumsa-Diyum and 50-Miao (ST) Assembly Constituencies in the State of Arunachal Pradesh which, according to the petitioners are discriminatory and also contrary to the Constitutional and statutory provisions.

3. The essential facts, in brief, which may be relevant for the purpose of consideration of the case may be referred to herein below.

4. During the 1960's due to various reasons, a large number of persons belonging to Chakma and Hajong communities in the erstwhile Pakistan, now Bangladesh, had migrated to State of Assam