[yding]

The people mentioned in the article are Americans. Also discrimination on the basis of ethnicity and national origin is illegal: https://www.dol.gov/general/topic/discrimination/ethnicdisc

[Melchizedek]

But if other "Americans" (maybe even with dual citizenship) of the same ethnicity and background have a propensity to spy on behalf of their country of origin, then it seems reasonable to be extra careful with such individuals.

[kushti]

Still, the discrimination is illegal and violates human rights (also, modern societies do not have a notion of collective responsibility).