(FILES) This file photo taken on January 04, 2016 shows Lech Walesa, fomer president of Poland, during an interview in his office in Gdansk, Poland. Polish prosecutors will on Tuesday, January 31, 2017, present what they believe is proof that Solidarity freedom hero Lech Walesa collaborated with the communist-era secret police, the state news agency PAP reported. / AFP PHOTO / PIOTR WITTMAN