"On more than one occasion we have attempted to convince workingmen of the absolute injury to their interests of the labor unions of the country, and also their oppressions and tyrannical course toward fellow workmen, as well as to their employers. The history of these organizations—generally managed, not by industrious workmen themselves, but by unprincipled demagogues who control them for their own benefit—furnishes abundant proof almost every day of their mischievous influence upon every industrial interest of the country."
January 1, 1970
https://en.wikiquote.org/wiki/Frederick_Douglass