The English subtitles are not a one to one translation. Some lines are slightly altered in order to make it easier to sing in English.
Der heimliche Aufmarsch is a poem by Erich Weinert written in 1929. In 1930, Wladimir Vogel composed music to it, and there is one extant recording of this original melody with Weinert himself providing the vocals. In 1931, Ernst Busch sang a version of the song at the end of the film Hell on Earth by Victor Trivas. The most famous version is the 1938 remake with a new arrangement by Hanns Eisler, which can be heard at Communist Party rallies from that point forward.
(Taken From "Der heimliche Aufmarsch" Wikipedia Page)
This Channel does not condone or support Communism and this video with made entirely for fun.