Departure from Poland to France, for political reasons #poland

wenglenski virginie


My great-grandparents left Poland (Lodz) and immigrated to France in 1913. I always heard that they left for political reasons.
Could someone tell me what could be understood by political reasons in those years? 
If I have managed to find any trace of my great-grandmother's family, I have never found anything about my great-grandfather Isaac Wenglinski (Piotrkow Trybunalski) in 10 years of research... Prison? Name change?
Thank you in advance and have a nice day.

Virginie Wenglenski

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