Agitator: (n.) a person--often paid--who stirs up others in order to upset the status quo and further a political, social, or other cause.
Woody Guthrie wrote the protest song, "This Land is Your Land" as a sarcastic response to Irving Berlin's "God Bless America." Here's a detailed discussion about the song on NPR's show On Point. What do you think of the logical fallacy Argumentum ad Populum?
"This Land is Your Land" by Woody Guthrie
This sweaty Bruce Springsteen knows the full version
(the version most people don't know):
Woody Guthrie tribute--several famous musicians sing the protest song: "This Land is Your Land"
Did Johnny Cash miss the point of the original version of this song?