Crossword Puzzle Devoted groups

Clue: Devoted groups

Indigenous groups (NATIVES with 7 letters)
Core groups begin operations? (CADRESROLL with 10 letters)
Groups headed by cols. (RGTS with 4 letters)
One of Juliette Low's groups (TROOP with 5 letters)
Sometimes warring groups (CLANS with 5 letters)
Groups in many Westerns (HERDSOFCATTLE with 13 letters)
Club devoted to community service (ROTARY with 6 letters)
Publications from special groups (NEWSLETTERS with 11 letters)
First of two groups that may come in handy for this puzzle? (THECOASTERS with 11 letters)
Social groups (e.g. CASTES with 6 letters)