Torn from the Flag (2009)

Torn from the Flag is the most successful documentary in Hungarian film history based on data by the Motion Picture Public Foundation of Hungary, Hungarian Filmunio (numbers of viewers, festival invitations, DVD sales, awards; distribution, Oscar competition, and amount of international publicity). According to several film critics (Stephen Farber, The Hollywood Reporter) and historians (István Deak, Columbia University), Torn from the Flag is the best documentary ever made about this topic.

More at Wikipedia.