6740
But opponents , led by the CWA , say new laws are needed because monitoring is heavily concentrated in service industries and 81 % of monitored workers are n't represented by unions .
 CWA, 81 %
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 CWA, 81 %