Sometimes it's possible to make hard statements about powerful people, without being obvious, and live to sing another day, by using irony or symbolism (symbolism now often being called "code"). I wonder whether any song suggested that slaveholders, cruel overseers, or other oppresssive or exploitative persons might be among those who would miss the glory train, or who would end up on the train going the opposite way. I don't know whether there are any such songs to be found, or how one would concisely search for them. But I must believe that the thought of addressing the ultimate plight of the powerful occurred to many who were exposed to the New Testament, and who suffered in this life.