The people I know who run factories tell me that foreign born workers work harder and for less than native born. Native born on the whole are fatter, lazier, and dumber than the foreign born workers they hire. Take it for what it's worth. I personally don't care who they hire. I just think it's interesting when I hear people complaining about immigrants displacing native born workers. There's a reason for it.

(Note: the foreign born workers they hire are legal, mostly through programs that place refugees in jobs. These factory managers participate in those programs because the results are so good for their productivity and employee retention.)