We know the union hates blacks, because they are aiding and abetting the wanton destruction of their jobs.
Labor unions can only get away with nonsense like this because their rank and file have very, very short term memories only.
From the dawn of the US labor movement and the Davis-Bacon Act, to the hundreds of complaints for racial discrimination filed against labor unions by minorities every year, labor unions -- like all other leftist organizations -- find minorities useful for electoral purposes, and do nothing to actually help them improve their conditions.