A referendum on employment protection was held in Switzerland on 17 February 1924. Voters were asked whether they approved of an amendment to the federal employment protection law. The proposal was rejected by 57.6% of voters.
Swiss employment protection referendum, 1924 Wikipedia
The referendum was an optional referendum, which only a majority of the vote, as opposed to the mandatory referendums, which required a double majority; a majority of the popular vote and majority of the cantons.