The organisation representing Switzerland's expatriate community has called on Swiss voters to back a free movement of people accord with the European Union.
The Council of the Swiss Abroad on Monday said the treaty – now up for extension to Bulgaria and Romania – had had a positive impact on the Swiss living abroad.
Of the 700,000 Swiss represented by the organisation, 400,000 live in EU countries.
The Council said the free movement treaty had established the principle of equal treatment for EU and Swiss citizens.
If voters reject the continuation and extension of the deal, the Council said, all Swiss living in the EU without dual citizenship would lose all of their rights.