S: (n) Ku Klux Klan, Klan, KKK (a secret society of white Southerners in the United States; was formed in the 19th century to resist the emancipation of slaves; used terrorist tactics to suppress Black people)
S: (n) cooperative (an association formed and operated for the benefit of those using it)
S: (n) club, social club, society, guild, gild, lodge, order (a formal association of people with similar interests) "he joined a golf club"; "they formed a small lunch society"; "men from the fraternal order will staff the soup kitchen today"
S: (n) family, fellowship (an association of people who share common beliefs or activities) "the message was addressed not just to employees but to every member of the company family"; "the church welcomed new members into its fellowship"
S: (n) Association of Southeast Asian Nations, ASEAN (an association of nations dedicated to economic and political cooperation in southeastern Asia and who joined with the United States to fight against global terrorism)