FILE-- In this April 13, 2016 file picture , Princeton professor Jan Tomasz Gross speaks to The Associated Press in Warsaw, Poland. Poland's nationalistic authorities decided recently to continue an investigation into whether Gross publicly insulted Poland, a crime carrying a prison term of up to three years, for comments on Polish violence against Jews during World War II. The case is seen as a test of the right-wing government's respect for freedom of expression and acceptance of open inquiry into the difficult issue of Polish-Jewish relations during the Holocaust. (AP Photo/Alik Keplicz,file)