That is not true. Poland run substantial trade deficits (as opposed to China) up to very recently giving sizable marked for products manufactured by western Europeans and thus __helping__ and not hindering West European workers. And this trade deficit was enabled by mainly external investments (and little but by subsidies). Also since PL was converging this investments were more profitable then in the west.

Also I am of not very popular anymore opinions that not distorted trade help both sides of the trade and immigrants really help economy of country that they immigrate into. Including workers.