The financier George Soros is part of a group of wealthy individuals calling for “a moderate wealth tax on the fortunes of the richest one-tenth of the richest 1 percent of Americans — on us.

The “us” includes self-made billionaires like the financier George Soros and Chris Hughes, a Facebook co-founder, as well as heirs to dynastic riches like the filmmaker Abigail Disney and Liesel Pritzker Simmons and Ian Simmons, co-founders of the Blue Haven Initiative, an impact investment organization….