"They hain't no RIGHT to shut him up! SHOVE!—and don't you lose a minute. Turn him loose! He ain't no slave; he's as free as any cretur that walks this earth!" (42.45)
Oh, Tom. Tom has no problem tricking Jim into staying locked up just to have a bit of fun, but once someone tries to take him back into slavery he get all outraged. Seems like even Tom can't see Jim as a real person.