SDCL § 22-10-9: Unlawful assembly--Misdemeanor.

Any person who assembles with two or more persons for the purpose of engaging in conduct constituting riot or aggravated riot or who, being present at an assembly that either has or develops such a purpose, remains there, with intent to advance that purpose, is guilty of unlawful assembly. Unlawful assembly is a Class 1 misdemeanor.