972
She was a Labour Member of Parliament from a by-election in 1929 until 1931 and then from 1945 to 1970 .
 organization: Labour
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Labour 
Answer:
 organization: Labour