IPC Sections
IPC Section 141 : Unlawful assembly
An assembly of five or more persons is designated an “unlawful assembly”, if the common object of the persons composing that assembly is:
 
1) To overawe by criminal force, or show of criminal force, 1the Central or any State Government or Parliament or the Legislature of any State, or any public servant in the exercise of the lawful power of such public servant; or
 
2) To resist the execution of any law, or of any legal process; or
 
3) To commit any mischief or criminal trespass, or other offence; or
 
4) By means of criminal force, or show of criminal force, to any person to take or obtain possession of any property, or to deprive any person of the enjoyment of a right of way, or of the use of water or other incorporeal right of which he is in possession or enjoyment, or to enforce any right or supposed right; or
 
5) By means of criminal force, or show of criminal force, to compel any person to do what he is not legally bound to do, or to omit to do what he is legally entitled to do.
 
Explanations :
 
  1) An assembly which was not unlawful when it assembled, may subsequently become an unlawful assembly.
IPC Section 142 : Being member of unlawful assembly
Whoever, being aware of facts which render any assembly an unlawful assembly, intentionally joins that assembly, or continues in it, is said to be a member of an unlawful assembly.
IPC Section 143 : Punishment
Whoever is a member of an unlawful assembly, shall be punished with imprisonment of either description for a term which may extend to six months, or with fine, or with both.
IPC Section 144 : Joining unlawful assembly armed with deadly weapon
Whoever, being armed with any deadly weapon, or with anything which, used as a weapon of offence, is likely to cause death, is a member of an unlawful assembly, shall be punished with imprisonment of either description for a term which may extend to two years, or with fine, or with both.
IPC Section 145 : Joining or continuing in unlawful assembly, knowing it has been commanded to disperse
Whoever joins or continues in an unlawful assembly, knowing that such unlawful assembly has been commanded in the manner prescribed by law to disperse, shall be punished with imprisonment of either description for a term which may extent to two years, or with fine, or with both.
IPC Section 146 : Rioting
Whenever force or violence is used by an unlawful assembly, or by any member thereof, in prosecution of the common object of such assembly, every member of such assembly is guilty of the offence of rioting.
IPC Section 147 : Punishment for rioting
Whoever is guilty of rioting, shall be punished with imprisonment of either description for a term which may extend to two years, or with fine, or with both.
IPC Section 148 : Rioting, armed with deadly weapon
Whoever is guilty of rioting, being armed with a deadly weapon or with anything which, used as a weapon of offence, is likely to cause death, shall be punished with imprisonment of either description for a term which may extend to three years, or with fine, or with both.
IPC Section 149 : Every member of unlawful assembly guilty of offence committed in prosecution of common object
If an offence is committed by any member of an unlawful assembly in prosecution of the common object of that assembly, or such as the members of that assembly knew to be likely to be committed in prosecution of that object, every person who, at the time of the committing of that offence, is a member of the same assembly, is guilty of that offence.
IPC Section 150 : Hiring, or conniving at hiring, of persons to join unlawful assembly
Whoever hires or engages, or employes, or promotes, or connives at the hiring, engagement or employment of any person to join or become a member of any unlawful assembly, shall be punishable as a member of such unlawful assembly, and for any offence which may be committed by any such person as a member of such unlawful assembly in pursuance of such hiring, engagement or employment, in the same manner as if he had been a member of such unlawful assembly, or himself had committed such offence.