Depends on the union but historically some unions have also been fairly anti-immigration and even racist. In response racial minorities formed their own unions.

Depends on the union but historically some unions have also been fairly anti-immigration and even racist. In response racial minorities formed their own unions. That said, the statement in and of itself isn't incorrect. There has and still are vulnerable members of society who are in the racial majority. In fact, some historians have argued that racism was promoted in the US as a way to separate the vulnerable whites from other vulnerable groups. Before slavery became self perpetuating in the US (as in child mortality rate among slaves was high enough that slave had to be shipped in from other places), racism towards Africans was actually less pronounced and interracial marriages between Africans and white weren't outlawed. Once slavery became self perpetuating, laws were passed and attitudes changed to ensure that vulnerable whites won't mingle with African slaves and endanger slavery.