I stand by my point that if the only example you can find is 150 years old (and also has literally no similarities to Snowden - e.g. it wasn't even a government

I stand by my point that if the only example you can find is 150 years old (and also has literally no similarities to Snowden - e.g. it wasn't even a government assassination or an enemy of the govt), you don't have much of a case.