Hundreds of millions of Americans are unwitting slaves to the internal revenue "service" of the United States federal government. There is no more appropriate term than slavery for the oppression that results in the involuntary payment of an "income tax" extorted for the rightful activity of exchanging one's labor for money.
Demands for such payment are thinly disguised claims of ownership, making the working population chattel, property of the federal government. This is an abominable evil that must be first recognized and spoken against.
Regarding your interesting article, and especially final illustration, it would be helpful if you could follow it up with references and perhaps recommendations of what, if anything, might be done about such a sorry state of affairs.
RE: The Evil of Slavery