 Complete the following phrase:  Within Czechoslovak cinema, Heydrich appears in the 1974 war film Sokolovo, where he is portrayed by Hannjo Hasse, an East German actor, who often represented Nazi villains in East European war movies. Czechoslovakia also participated in the making of the movie Operation Daybreak. The character of Heydrich is further frequently mentioned in Czechoslovak movies dealing with the topic of the Nazi reprisals which followed 