151. Whoever knowingly joins or continues in any assembly of five or more persons likely to cause a disturbance of the public peace, after such assembly has been lawfully commanded to disperse, shall be punished with imprisonment of either description for a term which may extend to six months, or with fine, or with both.
Explanation.-If the assembly is an unlawful assembly within the meaning of section 141, the offender will be punishable under section