[lern_too_spel]

This is mentioned in my link: "According to Pauling, carriers should have an obvious mark, (i.e. a tattoo on the forehead) denoting their disease, which would allow carriers to identify others with the same affliction and avoid marrying them."

The goal wasn't to mark people for ostracism but to make it easier for people carrying these genes to find mates that won't result in suffering for their offspring.