Koch Brothers . . . George Soros?

I find it amazing that liberals and socialists like Bernie Sanders (I) VT invoke the name of the Koch brothers as evil capitalists that donate $billions to conservative causes with the intent of destroying America, but fail to mention George Soros, the well-known progressive liberal contributor of $billions to a web of organizations that support a plethora of socialists political causes. 

But, then who ever said liberals are fair-minded?  It's not only what they say, but just as importantly, what they don't say.