Whose followers were first known as "The Red Shirts"?

The 'Camicie rosse' (Red Shirts) is the name given to the volunteers who followed Giuseppe Garibaldi in southern Italy during his Mille expedition to southern Italy, but sometimes extended to other campaigns of his. The name derived from the color of their shirts or loose-fitting blouses (complete uniforms were beyond the finances of the Italian patriots). The name is sometimes written in English as Redshirts or Red-Shirts.

During his years of exile, Garibaldi was involved in a military action in Uruguay, where in 1843 he originally used red shirts from a stock destined for slaughterhouse workers in Buenos Aires. Later he spent time in private retirement in New York City. Both places have been claimed as the birthplace of the Garibaldian red shirt.

Over the years other groups in Afghanistan, Bulgaria, Mexico, Mexico, South Africa, Southern United States, Taiwan, Thailand (and Star Trek) have taken the name "red shirts", but Garibaldi's group predates them.