To enforce any right or supposed right, in order to attract the provisions of s. 149 the prosecution must establish that there was an unlawful assembly and that the crime was committed in prosecution of the common object of the assembly. The assertion of a right of private defence within the limits prescribed by law cannot fall within the expression 'to enforce any right or supposed right' in the fourth clause of s. 141. The assembly could not be designated as an unlawful assembly if its object was to defend property by the use of force within the limits prescribed by law, State of Bihar v. Nathu Pandey, AIR 1970 SC 27: (1969) 2 SCC 207: (1970) 1 SCR 358.
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