You can check reporting of the Social Planbureau, Politie, of which some gets through to rijksoverheid.nl. Then there the usual suspects of publications that still maintain dedicated investigative journalists such as De Groene Amsterdammer and FTM. NRC and Volkskrant on occasion. De Telegraaf is an unusual exception to the pattern because their journalism is afwul, except their crime reporting (it sells so they pay for it).

You can also checkout where journalistic prizes go.

Keywords are ondermijnende of ontwrichtende criminaliteit.