Explain Section 141 regarding unlawful assembly.
Section 141 defines an unlawful assembly as an assembly of five or more persons with a common object, which includes overawing the Central or any State Government, resisting the execution of any law, committing mischief or criminal trespass, taking possession of property by criminal force, compelling a person to do what he is not legally bound to do, or knowingly joining an assembly that subsequently becomes unlawful. [Chapter 8, Section 141]