On October 12, 2018, the New York Times published an article by Lodon Wainwright III titled Them's Fightin' Words: 10 Great Protest Songs. He wisely didn't say "10 greatest protest songs," so he's my kinda guy. His list (not necessarily in order of anything in particular):

1. We Shall Overcome
   
2. The Lonesome Death of Hattie Carroll (Dylan)
   
3. We Will All Go Together When We Go (Tom Lehrer)
   
4. Little Boxes (Malvina Reynolds)
   
5. Okie from Muskogee
   
6. My Old Man (Ewan MacColl)
   
7. Arthur McBride
   
8. If It Were Up to Me (Cheryl Wheeler)
   
9. Don't Call Me Buckwheat (Garland Jeffreys)
   
10. America the Beautiful (Katharine Lee Bates)