 Most controversially, the revision allowed for a continuation of the governmental distribution of heroin to heavily addicted persons.Objecting to that programme and demanding a strict policy of prohibition, a committee of conservative politicians of the Federal Democratic Union and Swiss People's Party collected 51,969 valid signatures against the change in law, thereby subjecting it to a popular referendum.The initiative for the restriction of the right of associations to appeal against building projects (, ) provided for an amendment to the Federal Constitution.