labor union

NOUN /leɪbər_'junjən/
11 LETTERS · 3 SYLLABLES · STARTS WITH L

labor union is a valid 11-letter word worth 12 points in Scrabble and 17 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
L1A1B3O1R1U1N1I1O1N1
1 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 =12 PTS
DOUBLE WORD → 24TRIPLE WORD → 36
MEANING

What does labor union mean?