Piketty covers this extensively in Capital and Ideology and comes to the opposite conclusion with charts of data of wealth taxation versus income inequality in every country for which there is reliable data. There has only been progressive wealth taxation for a short time period in the USA and the UK off the top of my head.
An example: the communist revolution in Russia in 1917. (The “negative effect” included millions of people getting murdered, killed by the famine, or imprisoned.)