108755
Throughout modern history , various governments , usually during times of war , would inspect mail coming into or leaving the country so as to prevent an enemy from corresponding with unfriendly entities within that country .
 modern history
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:
 modern history