100767
They may join unions such as National Railway Workers ' Union , but their abilities to call a strike is severely limited by government legislation ; there is very little tolerance for railway work stoppage .
 National Railway Workers ' 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:
 National Railway Workers ' Union