84143
It was built only in prototype form , and was converted into a land-based aircraft after Joseph Stalin 's death in 1953 cancelled the aircraft carriers being designed .
 Joseph Stalin
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:
 Joseph Stalin