They are not far left, they are globalist. This is: far left when it comes to social issues in the US (feminism, uncontrolled immigration, etc) but also nuke all the Muslim countries and drag the US into an endless war.
This "far-left" talk just seems fabricated to create a "both sides" narrative with the alt-right.
The idea that immigrants are people who deserve respect and opportunity, and the idea that women deserve equality are not "far-left", they are cornerstones of the underlying values of the left - that people are people and deserve rights and opportunity, regardless of factors out of their control.