Geneva ? The campaign poster was blatant in its xenophobic symbolism: Three white sheep kicking out a black sheep over a caption that read “for more security.”

The message was not from a fringe force in Switzerland’s political scene but from its largest party.

The nationalist Swiss People’s Party is proposing a deportation policy that anti-racism campaigners say evokes Nazi-era practices. Under the plan, entire families would be expelled if their children are convicted of a violent crime, drug offenses or benefits fraud.

The party is trying to collect the 100,000 signatures needed to force a referendum on the issue. If approved in a referendum, the law would be the only one of its kind in Europe.

“We believe that parents are responsible for bringing up their children. If they can’t do it properly, they will have to bear the consequences,” Ueli Maurer, president of the People’s Party, told The Associated Press.