MY masters? lol, that is rich. Anyway, if you would have seen and understood the context in which I used the word left you would not have made this comment I reckon.
And there is a 'left' in the US, which is obvious to you since you used the word 'right'. That group may be considered 'right' or moderate elsewhere, but since it is to the left of the right, and we are using these terms in the context of a spectrum which is key, I think it is fair to use that term. We all know what it refers to regardless of any pedantry you wish to bring up.
In short, 'left' means those who are 'left' of the 'right' wherever that may put them on the grand scale political spectrum.
Another reason why I don't really like these labels as well as liberal/conservative as well but it is unavoidable in this forum. They tend to make people put everything into boxes.