Article 19 Protection of certain rights regarding freedom of speech, etc.

(1) All citizens shall have the right -
(a) to freedom of speech and expression;
(b) to assemble peaceably and without arms;
(c) to form associations or unions;
(d) to move freely throughout the territory of India;
(e) to reside and settle in any part of the territory of India; and
(f) to practice any profession, or to carry on any occupation, trade or business.
(2) Nothing in sub-clause (a) of clause (1) shall affect the operation of any existing law, or prevent the State from making any law, in so far as such law imposes reasonable restrictions on the exercise of the right conferred by the said sub-clause in the interests of the sovereignty and integrity of India, the security of the State, friendly relations with foreign States, public order, decency or morality, or in relation to contempt of court, defamation or incitement to an offence.
(3) Nothing in sub-clause (b) of the said clause shall affect the operation of any existing law in so far as it imposes, or prevent the State from making any law imposing, in the interest of the sovereignty and integrity of India or public order, reasonable restrictions on the right conferred by the said sub-clause.
(4) Nothing in sub-clause (c) of the said clause shall affect the operation of any existing law in so far as it imposes, or prevent the State from making any law imposing, in the interests of the the sovereignty and integrity of India or public order or morality, reasonable restrictions on the exercise of the right conferred by the said sub-clause.
(5) Nothing in sub-clause (d) and (e) of the said clause shall affect the operation of any existing law in so far as it imposes, or prevent the State from making any law imposing, reasonable restrictions on the exercise of any of the rights conferred by the said sub-clauses either in the interests of the general public or for the protection of the interests of any Schedule Tribe.
(6) Nothing in sub-clause (g) of the said clause shall affect the operation of any existing law in so far as it imposes, or prevent the State from making any law imposing, in the interests of the general public, reasonable restrictions on the exercise of the right conferred by the said sub-clause, and, in particular, nothing in the said sub-clause shall affect the operation of any existing law in so far as it relates to, or prevent the State from making any law relating to, -
(i) the professional or technical qualifications necessary for practicing any profession or carrying on any occupation, trade or business, or
(ii) the carrying on by the State, or by a corporation owned or controlled by the State, of any trade, business, industry or service, whether to the exclusion, complete or partial, of citizens or otherwise.

Article 20 Protection in respect of conviction for offenses

(1) No person shall be convicted of any offence except for violation of a law in force at the time of the commission of the act charged as an offence, not be subjected to a penalty greater than that which might have been inflicted under the law in force at the time of the commission of the offence.
(2) No person shall be prosecuted and punished for the same offence more than once.
(3) No person accused of any offence shall be compelled to be a witness against himself.

Article 21 Protection of life and personal liberty
No person shall be deprived of his life or personal liberty except according to procedure established by law.

Article 22 Protection against arrest and detention in certain cases

(1) No person who is arrested shall be detained in custody
without being informed, as soon as may be, of the grounds for such arrest nor shall he be denied the right to consult, and to be defended by, a legal practitioner of his choice.
(2) Every person who is arrested and detained in custody shall be produced before the nearest magistrate within a period of twenty-four hours of such arrest excluding the time necessary for the journey from the place of arrest to court of the magistrate and no such person shall be detained in custody beyond the said period without the authority of a magistrate.
(3) Nothing in clauses (1) and (2) shall apply -
(a) to any person who for the time being is an enemy alien; or
(b) to any person who is arrested or detained under any law providing for preventive detention.
(4) No law providing for preventive detention shall authorize the detention of a person for a longer period than three months unless -
(a) an Advisory Board consisting of persons who are, or have been, or are qualified to be appointed as, Judges of a High Court has reported before the expiration of the said period of three months that there is in its opinion sufficient cause for such detention:
Provided that nothing in this sub-clause shall authorise the detention of any person beyond the maximum period prescribed by any law made by Parliament under sub-clause (b) of clause (7); or
(b) such person is detained in accordance with the provisions of any law made by Parliament under sub-clauses (a) and (b) of clause (7).
(5) When any person is detained in pursuance of an order made under any law providing for preventive detention, the authority making the order shall, as soon as may be, communicate to such person the grounds on which the order has been made and shall afford him the earliest opportunity of making a representation against the order.
(6) Nothing in clause (5) shall require the authority making any such order as is referred to in that clause to disclose facts which such authority considers to be against the public interest to disclose.
(7) Parliament may by law prescribe -
(a) the circumstances under which, and the class or classes of cases in which, a person may be detained for a period longer than three months under any law providing for preventive detention without obtaining the opinion of an Advisory Board in accordance with the provisions of sub-clause (a) of clause (4);
(b) the maximum period for which any person may in any class or classes of cases be detained under any law providing for preventive detention; and
(c) the procedure to be followed by an Advisory Board in an inquiry under sub-clause (a) of clause (4).