Efforts in the Polish region of Silesia to honor Ernest Wilimowski, a local star who played for the national teams of both Poland and Nazi Germany, are raising tricky questions about national loyalty and betrayal.

People walking by a mural of Ernest Wilimowski in May in Chorzow, Poland.Credit...Maciek Nabrdalik for The New York Times

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By Andrew Higgins

Reporting from Chorzow and Katowice, Poland