I'm not all too sure myself. I think it was about child benefits. People get money for having children, to feed them and for clothes and books and toys and everything. Kids are expensive. We have quite a sophisticated social security system in the Netherlands. It's almost socialist, just not quite. We pay huge amounts of taxes and taxes over taxes. So, it must have had something to do with the child protection 'service'. "De kinderbescherming". Or that's what it was called when I was young. They have the power to take children away if they decide that the parents don't take care of the kids well enough. Somehow it must be a combination of those two systems... I don't know exactly. I should research it to answer that question.
Anyway, somehow over 1500 children got missing ... I can't even find anything on internet ... Here it is. This explains it much better than I can.

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The allowance affair (also known as the childcare allowance affair or allowance scandal) is a Dutch political affair as a result of unjustified suspicions of fraud with allowances and a strict recovery policy from the central government.

This is the official story though. You can count on it that it was done purposefully to ... to [oi] torture and kill the small ones for adrenochrome, the 6+ for their organs, or for sex or intergalactic slavery, it's worse than we can imagine. This has been happening for 6 to 150 millennia. We only just became aware of these atrocities, which of course is an understatement. All superlatives we can think of combined, can't cover the magnitude of these sickening practices.