South Dakota Codified Laws
Chapter 10 - Riot And Unlawful Assembly
Section 22-10-9 - Unlawful assembly--Misdemeanor.

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.

Source: SDC 1939, §13.1402; SL 1976, ch 158, §10-5; SL 2005, ch 120, §349.