Child of the Big City is a Russian version of a vamp movie, with a touch that makes it different from other stories about poor girls who drain and ruin rich men. 1914 was Russia's craze year for the tango. Elena Smirnova, as the heartless seducer, and G. Iost, as the lover whom she prefers over the unfortunate (and wealthy) suitor who keeps her, are two Moscow ballroom dancers who were already famous as a tango couple. Watch for the bold overhead dolly-in over restaurant tables homing in on a cabaret dancer who happens to be Bauer's wife, Lina.
Source : http://hcl.harvard.edu