Crossword Puzzle Group think?

Clue: Group think?

Gangster group (MOB with 3 letters)
Group of hoods (GANG with 4 letters)
"Local" group (UNION with 5 letters)
Groups of three (e.g. TRIADS with 6 letters)
Captain's group (CREW with 4 letters)
Group whose album "St. Elsewhere" was #2 on Spin Magazine's 40 Best Albums of 2006 (GNARLSBARKLEY with 13 letters)
Fifties revival group (SHANANA with 7 letters)
Roller-derby grouping (PACK with 4 letters)
Group of ants (e.g. ARMY with 4 letters)
Group please with knees? (RHYME with 5 letters)