Red Plague -

: A galvanic cell forms where silver acts as the cathode and copper as the sacrificial anode.

: It was a common epithet for Communism , notably appearing in Józef Szczepański's 1944 poem Czerwona Zaraza during the Warsaw Uprising. Red Plague

In medical history, the term has occasionally been applied to high-mortality diseases that lacked public attention: : A galvanic cell forms where silver acts