More than 13,000 Conversos were put on trial during the first 12 years of the Spanish Inquisition. Hoping to eliminate ties between the Jewish community and Conversos, the Jews of Spain were expelled in 1492 ..
A second reason, specifically for using Morse Code during the Second World War, was encoding... Nowadays equipment exists to take an outgoing radio signal and automatically encrypt the data or voices during transmission, this is 'on-line' encryption...
I'm going to answer two questions here... firstly, a question you haven't asked Why use morse code? and then I'll get round to answering your actual question How was morse code used?. Ok. Why use Morse Code? If you look at the sound of a human voice on an oscilloscope display you'll see a mess of differing frequencies and amplitudes...