You might have heard of Groucho, Harpo, Chico and Zeppo but who was Gummo Marx? He was the original fourth Marx brother. When he entered the Army during World War I, Zeppo took his place as straight man. This is while the brothers were doing vaudeville and before they hit it big in the movies. After leaving the Army, Gummo went into the raincoat business, then had quite a bit of success operating a theatrical agency.