Section 149 IPC

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.

CLASSIFICATION OF OFFENCE
Punishment—The same as for the offence—According as offence is cognizable or non-cognizable—According as offence is bailable or non-bailable—Triable by court by which the offence is triable—Non-compoundable.

COMMENTS
(i) It is well settled that once a membership of an unlawful assembly is established, it is not incumbent on the prosecution to establish whether any specific overt act has been assigned to any accused. Mere membership of the unlawful assembly is sufficient;
State of Maharashtra v. Joseph Mingel Koli, (1997) 2 Crimes 228 (Bom)

(ii) Every member of an unlawful assembly is vicariously liable for the acts done by others either in the prosecution of the common object of the unlawful assembly or such which the members of the unlawful assembly knew were likely to be committed;
State of Maharashtra v. Joseph Mingel Koli, (1997) 2 Crimes 228 (Bom)

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