The group helped to bring hip hop street-style to the masses...
Rap group Run-DMC has filed a $50m (€47m) lawsuit against a number of retailers who have been accused of using the group's name on goods without their permission.
Darryl "DMC" McDaniels from the trio owns a firm called Run-DMC Brand - it filled the complaint in a district court in New York.
The retailers who have been selling the merchandise, which includes hats and t-shirts, include Amazon and Walmart.
As one of the genre's founding fathers, the group is remembered as much for its influence on hip hop fashion as its musical output.
A recent trend for retro music t-shirts has led to a spike in demand for Run-DMC merch.
It sells band apparel through RunDMC.com - and also has a deal with Adidas.
Their third album Raising Hell included the single 'My Adidas.' When it was released they were fans rather than brand ambassadors - but that soon changed.
The German brand carries Run-DMC lines to this day.
Run-DMC has sold more than 230 million records worldwide.