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.
1.If an offence is cognizable, police has the authority to arrest the accused without a warrant and to start an investigation with or without the permission of a court. Otherwise police does not have the authority to arrest the accused without a warrant and an investigation cannot be initiated without a court order.
2.If an offience is bailable, police has the authority to release the accused on bail on getting the defined surety amount along with a duly filled bail bond at the concerned police station. Otherwise arrested person has to apply for bail before a magistrate or court
3. If an offence is compoundable, a compromise can be done between the accused and the victim, and a trial can be avoided. Otherwise, No compromise is allowed between the accused and the victim except under certain situations, where the High Court or the Supreme Court have the authority for quashing a matter.
Description : IPC - SECTION 149 - Every member of unlawful assembly guilty of offence committed in prosecution of common object
This section is a very important provision with regard to group liability. It is also known as laying down a principle of joint or vicarious or constructive criminal responsibility.