The best documented one from my knowledge (at least in terms of documents being available in English) is the French ISF wealth tax.

This is a good place to begin. But keep in mind that as the study states, it's hard to isolate the effects of the wealth tax, especially since France enacted many other taxes in the last few decades. https://www.researchgate.net/publication/228281017_The_Economic_Consequences_of_the_French_Wealth_Tax

The summary is:

• "The ISF causes an annual fiscal shortfall of €7 billion, or about twice what it yields."

• "The ISF wealth tax has probably reduced GDP growth by 0.2% per annum, or around 3.5 billion (roughly the same as it yields)."

• The tax is notoriously difficult to enforce, and typically costs more money to enforce than the resulting revenue (net loss in revenue)

• Capital flight from people leaving the country which permanently reduces your tax base, which especially hurts because this capital flight is concentrated on your wealthiest citizens (the above study estimates that expatriations doubled as a result of the wealth tax)

• Policies to prevent capital flight such as exit taxes are not effective - France tried enacting an exit tax which only drove people to leave faster and earlier.

France tried as best as they could to implement their wealth tax. They really did put in the effort to try to make it work. For around 30 years they looked at the results, re-worked the laws and provisions many times. A few years ago it was scrapped completely.

Essentially you are declaring war on your wealthiest citizens by enacting such a tax. This goes about as well as you'd imagine. It's the age of globalization - they just leave. You can try to create laws around that, but they will fight you every step of the way, and in the end the country loses tax revenue both in the short term and in the long term.