The man appointed by Poland to fight hate speech on the internet belonged to a group with racist and antisemitic views.
The Polish government will map out all the Jewish cemeteries in the country and establish a computerised database with information about the people buried there.
Three children overturned 15 gravestones at the Jewish cemetery in Opole, in south-western Poland.
The largest bookstore chain in Poland has stopped selling a book written by a nationalist former priest accused of antisemitism, after customers threatened it with a boycott over the weekend.
Polish leaders led an Independence Day march that included members of nationalist organisations, the first time Polish state officials have marched with the far-right groups.
A Polish prosecutor who twice tried to halt the investigation into an article written by a Princeton University professor saying that Poles killed more Jews than Germans during World War II has been demoted.