With this imagery, Uncle Sam begged Americans to join the fight in 1917 as the US deployed into the first world war. It was so popular, he used it again the second time around.
The Uncle Sam nomenclature supposedly stems from a packer who supplied meat to the Army in the War of 1812, Sam Wilson. Ironically, he's remembered as a man of great fairness and honesty.
We are all living in the world in which you have to cover your telescreen camera with a piece of duck tape.
In modern culture, the term "Big Brother" has entered the lexicon as a synonym for abuse of government power, particularly in respect to civil liberties, often specifically related to mass surveillance.
Under his eye, there is no place to hide.