Homework / test English to Polish Social Sciences Anthropology

alien enemy/enemy alien - a citizen of a country which is in a state of conflict with the land in which he or she is located, such as eg. German Americans living in the USA during WWI.

eg. (...) to investigate a number of breweries around the country which are owned in part by alien enemies.

I have to use domestication strategy while translating the text.
I thought about "imigranci wywodzący się z kraju nieprzyjaciela" however it is descriptive and I do not know if it is acceptable.