90602
( They were mainly bordermen from the Potiska and Pomoriaka border zones — known as Kraine — in course of time these Serbs merged with the Cossacks , and partly with the Moldavians , who live in the southern part of Imperial Russia . )
 Imperial Russia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Imperial Russia