The Combat League of Revolutionary National Socialists (German: Kampfgemeinschaft Revolutionärer Nationalsozialisten, KGRNS), more commonly known as the Black Front (German: Schwarze Front), was a political group formed by Otto Strasser in 1930 after he resigned from the Nazi Party (NSDAP) to avoid being expelled.

The group reflected Strasser's political views, such as revolutionary nationalism, and its criticism of capitalism was expressed in economic antisemitic terms rather than socialism.

The Black Front was composed of radical former Nazis who intended to cause a split in the party, and adopted the crossed hammer and sword symbol that is still used by several Strasserite groups.

The remaining anti-capitalist elements of the Nazis were eradicated in 1934 during the Night of the Long Knives, in which Gregor Strasser, Otto's older brother, was killed.

[4] Otto Strasser spent the years of the Third Reich in exile, first in Czechoslovakia (then the First Czechoslovak Republic) and later in Canada, before returning to West Germany in 1953.