The Undercurrent was a 1919 American silent directed by Wilfrid North, produced by Guy Empey, distributed by Select Pictures.

[2] The Undercurrent is one of several films from around the same period inspired by if not fanning the flames of the Red Scare which followed World War I and the Russian Revolution of 1917.

[4][5] In the November 14, 1919 issue of Variety, Charlie Chaplin found it necessary to state "I am absolutely cold on the Bolshevism theme; neither am I interested in Socialism" in order to allay fears of where his sympathies lay in regards to the making of Red Scare films.

[7] Jack Duncan, a returning World War I veteran joins a group of Bolsheviks.

Mariska, a Russian agent who, upon learning that the authorities are about to arrest her, shoots a fellow provocateur and then turns the weapon on herself.