[A] Central Government via an order
We must note here that ONLY central government has been given power to deprive a person from his / her citizenships. For a better understanding, kindly go thru the section 10 of Citizenship act 1955, given below.

10. Deprivation of citizenship. —

(1) A citizen of India who is such by naturalisation or by virtue only of clause (c) of article 5 of the Constitution or by registration otherwise than under clause (b) (ii) of article 6 of the Constitution or clause (a) of sub-section (1) of section 5 of this Act, shall cease to be a citizen of India, if he is deprived of that citizenship by an order of the Central Government under this section. (2) Subject to the provisions of this section, the Central Gov­ernment may, by order, deprive any such citizen of Indian citi­zenship, if it is satisfied that— (a) the registration or certificate of naturalisation was ob­tained by means of fraud, false representation or the concealment of any material fact; or (b) that citizen has shown himself by act or speech to be dis­loyal or disaffected towards the Constitution of India as by law established; or (c) that citizen has, during any war in which India may be en­gaged unlawfully traded or communicated with an enemy or been engaged in, or associated with, any business that was to his knowledge carried on in such manner as to assist an enemy in that war; or (d) that citizen has, within five years after registration or naturalisation, been sentenced in any country to imprisonment for a term of not less than two years; or (e) that citizen has been ordinarily resident out of India for a continuous period of seven years, and during that period, has neither been at any time a student of any educational institution in a country outside India or in the service of a Government in India or of an international organisation of which India is a member, nor registered annually in the prescribed manner at an Indian consulate his intention to retain his citizenship of India. (3) The Central Government shall not deprive a person of citizen­ship under this section unless it is satisfied that it is not conducive to the public good that the person should continue to be a citizen of India. (4) Before making an order under this section, the Central Gov­ernment shall give the person against whom the order is proposed to be made notice in writing informing him of the ground on which it is proposed to be made and, if the order is proposed to be made on any of the grounds specified in sub-section (2) other than clause (e) thereof, of his right, upon making application therefor in the prescribed manner, to have his case referred to a committee of inquiry under this section. (5) If the order is proposed to be made against a person on any of the grounds specified in sub-section (2) other than clause (e) thereof and that person so applies in the prescribed manner, the Central Government shall, and in any other case it may, refer the case to a Committee of Inquiry consisting of a chairman (being a person who has for at least ten years held a judicial office) and two other members appointed by the Central Government in this behalf. (6) The Committee of Inquiry shall, on such reference, hold the inquiry in such manner as may be prescribed and submit its report to the Central Government; and the Central Government shall ordinarily be guided by such report in making an order under this section.