In 1943 Mr. Snowden would have been quite lucky if he got a trial before he was executed. We were fighting for our lives back then.
As to the rest, it is a matter of scale. In 1790 I could follow you around and publish your daily activities in the paper. Unless you hired 50% of the population to be reporters to follow the other 50% and then switched them off every other day, no one could possibly publish what everyone did in every country every day.
In 1980 the CIA/NSA/KGB/MI5/MI6/Mossad/etc. could do a fair amount of spying, but the analog nature of much of it and the primitive computers pretty much made sure they weren't spying on YOU because no one had the time and money to waste on Joe Average. The STASI in East Germany actually did try the 50% spies on the other 50% system and buried themselves under an avalanche of data they had no time to deal with.
The various agencies aren't doing anything they didn't do in 1914, it is just the scale of it is beyond the wildest dreams of any old cold war spy. We really can spy on everyone all the time forever :(