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Protesters shouted “Nazi scum, off our streets” and attempted to disrupt a demonstration by white nationalist Richard Spencer and alt-right activists outside the White House on Sunday, Dec. 3.

Police, many in body armor, created a physical barrier between alt-right activists and members of the left wing group “antifa,” which is short for “anti-fascist.”

Spencer led alt-right activists as they chanted “Crush all commies.”

READ MORE: No, Antifa is not starting a civil war in America this weekend

Spencer, who has become the face of the “alt right” movement, is the co-editor of AltRight.com and the president of the National Policy Institute, a think-tank. The alt-right are a loosely affilliated collection of groups and individuals characterized by a rejection of mainstream politics that includes neo-Nazis, white supremacists and anti-Semites.

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WATCH: Richard Spencer speech derails into shouting match with angry protesters

1:41 Richard Spencer speech derails into shouting match with angry protesters Richard Spencer speech derails into shouting match with angry protesters

Fearing violence after showdowns between the two extremist groups in Charlottesville, Virginia and Florida, police escorted Spencer’s group away and walking with them for several block until they reached a subway station.

WATCH: Richard Spencer says Charlottesville was good for the alt-right movement

1:35 Richard Spencer: Charlottesville was good for the alt-right movement Richard Spencer: Charlottesville was good for the alt-right movement

Before he departed, Spencer yelled, “Build the wall today. We’ll be back.”

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The dueling demonstrations appeared to be mostly peaceful.