Answer: Bob Dylan, Creedence Clearwater Revival
Step-by-step explanation:
Bob Dylan is the first example that comes to mind, with songs like "Masters of War", where the initial lyrics are:
"Come you masters of war
You that build the big guns
You that build the death planes
You that build all the bombs
You that hide behind walls
You that hide behind desks..."
Another example may be Creedence Clearwater Revival, with songs like "Fortunate Son" with the initial lyrics:
"Some folks are born made to wave the flag,
Ooh, they're red, white and blue.
And when the band plays "Hail to the chief",
Ooh, they point the cannon at you, Lord..."
Where you can see that a common topic in the protest songs was the anti-war movement.