So far this year, the project Fair Play Bygg has received more tips than in all of 2018. The 207 tips range from illegal work to tax evasion and human trafficking.
It's at such a high level that it's not healthy for the Swedish construction industry and something needs to be done", says Peter Leander from Fair Play Bygg.
Some tipsters also report harsh conditions on building sites with unsafe work practices. Many of the workers are from non-EU countries such as Russia, the Balkans, Ukraine and Latin America.
But there is now a plan to address some of the issues within the building industry. The Swedish Construction Federation says it is working with people, organisations and companies involved in the building sector to map out a national strategy for dealing with the problems.