Crossword Puzzle Community group since 1915

Clue: Community group since 1915

Community service group (ELKS with 4 letters)
Community group: Abbr. (YMCA with 4 letters)
"Jive Talkin'" group, and a hint to this puzzle's theme (BEEGEES with 7 letters)
Marketing group (SALESFORCE with 10 letters)
Retro group at Woodstock (SHANANA with 7 letters)
Chieftains' groups (CLANS with 5 letters)
Atty. group (ABA with 3 letters)
Group whose name is an acronym (NSYNC with 5 letters)
Health care group (HEARTASSOCIATION with 16 letters)
Flattered most sincerely (APED with 4 letters)