intelligence service

NOUN /ɪn'tɛlɪdʒəns_'sɜrvɪs/
20 LETTERS · STARTS WITH I

intelligence service is a valid 20-letter word worth 27 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1N1T1E1L1L1I1G2E1N1C3E1S1E1R1V4I1C3E1
1 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 1 + 1 + 3 + 1 + 0 + 1 + 1 + 1 + 4 + 1 + 3 + 1 =27 PTS
DOUBLE WORD → 54TRIPLE WORD → 81
MEANING

What does intelligence service mean?