Horst-Wessel-Lied is German for "Horst Wessel Song". It is also sometimes referred to as "Die Fahne hoch" ("The Flag Up High"). The song was the anthem of the Nazi Party from 1930 to 1945.
Wessel was murdered in February 1930, and was declared a martyr to the Nazi movement. The Horst Wessel Song was first sung publicly at his funeral and became very popular at Nazi gatherings.
This popularity ensured that the song would forever be ascribed to Wessel, however, German critics maintained that the melody of the song preexisted Wessel's publication by many years.
However, all criticism stopped on May 19, 1933, when Adolf Hitler declared Horst-Wessel-Lied to be recognized as a national symbol of Germany and the Nazi Party, and questioning of Wessel's authorship became treason.
When the Nazi regime fell, in 1945, the Horst-Wessel-Lied was banned in both Germany and Austria, except for educational purposes.
- Wikipedia: en.wikipedia.org/wiki/Horst-Wessel-Lied