Eisenstein:
Strike
Battleship Potemkin
October (aka 'Ten Days That Shook the World')
The General Line (aka 'The Old and the New')
Alexander Nevsky
Ivan the Terrible (parts I and II)
Pudovkin:
Mother
The End of St. Petersburg
Storm Over Asia (aka 'The Heir of Genghis Khan')
Vertov:
Kino-Eye
The Man With a Movie Camera
Enthusiasm (aka 'Symphony of the Donbass')
One Sixth of the World
Kuleshov:
The Extraordinary Adventures of Mister West in the Land of the Bolsheviks
Tarkovsky:
Ivan's Childhood
Andrei Rublev
Solaris
Mirror
Stalker
Nostaghia
The Sacrifice
Among many, many more.... Cinema (especially in the silent era) was one of the cultural glories of the Soviet Union, something that all Russians and all Communists should feel proud of.
By the way, Stalin's favourite film was 'Volga, Volga', a musical comedy directed by Alexandrov, one of Eisenstein's collaborators in the 20s. Stalin watched it so often that he knew the dialogue by heart and could recite it simultaneously with the actors. He watched it at least once a week from the time it was made until his death.