… big thinkers like Adam Smith, Thomas Jefferson, Ayn Rand, and the like …

May I suggest that Thomas Jefferson be excluded from consideration, along with any other so-called “liberal” or “libertarian” who unrepentantly presumed to dominate his fellow human beings and force them into an abject condition of chattel slavery?

As for genuinely libertarian heroes, off the top of my head, I’d like to recommend Thomas Paine, Henry David Thoreau, William Lloyd Garrison, Wendell Phillips, Frederick Douglass, Sarah Moore Grimké, Elizabeth Cady Stanton, Lysander Spooner, Stephen Pearl Andrews, Ezra Heywood, Angela Tilton Heywood, Benjamin Tucker, William Graham Sumner, Mark Twain, Dyer Lum, Voltairine de Cleyre, Emma Goldman, Randolph Bourne, Murray Rothbard, Karl Hess, and Samuel E. Konkin III.

For what it’s worth, to-day is the 200th birthday of Lysander Spooner, one of America’s foremost radical libertarian heroes.