Music sales remain a primary income generating source for racist groups, and help to drive membership.

A recent mass killing at a Sikh temple in the United States has put neo-Nazi music into the spotlight.

The gunman, Wade Michael Page, was a white supremacist who played in several bands.

According to the Southern Poverty Law Center, which tracks hate groups, music sales are a primary source of income for racist groups and a rich recruiting ground for new members.

There is also evidence that Neo-Nazis have a presence in the institution that Americans say they most admire: the US military

Al Jazeera’s Rob Reynolds reports from Los Angeles.