Under Section 141 of the Indian Penal Code, an assembly of five or more persons becomes unlawful if the object is: (a) to resist the execution of any law or legal process; (b) to forcibly occupy the property of some person; (c) to commit any mischief or criminal trespass; (d) to force some person to do an illegal act; and (e) to threaten the government or its officials on exercising lawful powers.