This is a Workers Guardian patch from Hungary.
A Workers Guardian was a worker who was trained much like the miliairy in order for the civil defense of Hungary. The militairy budget of Hungary was drastically reduced in order to give the people a better living standard.
Millions of working class people (labours) trained with rifles, mortars, machine guns and artillery to support the regular army in case of war. All this was originated by Janos Kadar who was the communist leader of Hungary who ruled over Hungary from 1956 untill his retirement in 1988. He ruled for 32 years and died in 1989.