Indiana Code Title 35. Criminal Law and Procedure § 35-45-1-1

Sec. 1. As used in this chapter:

“Tumultuous conduct” means conduct that results in, or is likely to result in, serious bodily injury to a person or substantial damage to property.

“Unlawful assembly” means an assembly of five (5) or more persons whose common object is to commit an unlawful act, or a lawful act by unlawful means. Prior concert is not necessary to form an unlawful assembly.