50885
During the late 1960 s , the Baseball Players Union became much stronger and conflicts between owners and the players ' union led to major work stoppages in 1972 , 1981 , and 1994 .
 Baseball Players Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Baseball Players Union