...
There’s a preacher in the pulpit, Bible in his hand
And the sister’s way back in the amen corner hollerin’: “That’s my man!”
...
Papa Charlie Jackson

Part of a church or meeting house (usually consisting of seats close to the pulpit) used by members of the congregation who lead the responses to prayers or preaching. An area occupied by particularly fervent worshippers.

Amen Corner was founded in 1966 in Cardiff (Wales) by Andy Fairweather Low, among others. The band is named after a venue in Cardiff, The Amen Corner, where Dr. Rock played soul records from the United States every Sunday. Initially they mainly play jazz and blues music, such as Gin House Blues.

This version of Gin House Blues was written in the late twenties by pianist and songwriter James C. Johnson. "Stay away from everybody, 'cause I'm in my sin...".
This version was recorded by Nina Simone, The Animals, Cuby and The Blizzards, among others.

On one level it’s about people hoping they can escape their misery by riding on this imaginary chariot to heaven, but another clear meaning is the idea that the chariot is a metaphor for escaping to freedom. In this case, “swing low” is a call for abolitionists to visit the southern United States, where slaves were being held. Coming for to carry me home.

“Swing Low, Sweet Chariot” enjoys a hallowed status as one of the cherished of 19th-century African-American spirituals, its forlorn lyrics invoking the darkness of slavery and the sustained oppression of a race.

Swing Low, Sweet Chariot" was composed by Wallace Willis, a Choctaw freedman in the old Indian Territory (Oklahoma 1865). He may have been inspired by the sight of the Red River, by which he was toiling, which reminded him of the Jordan River and of the Prophet Elijah being taken to heaven by a chariot. Some sources claim that this song had lyrics that referred to the Underground Railroad; the freedom movement that helped black people escape from Southern slavery to the North and Canada.

Lion's den: a place or situation in which someone must deal with an angry person or group of people. He knew that he would be facing an angry crowd, but he entered the lion's den without hesitating.
God locked their jaw: no danger would touch them.

The Voting Rights Act of 1965 was an effort by the U.S. Congress to outlaw voting regulations and procedures in Alabama and other states. In the South African Americans were denied voting rights. It led to a march from Selma to Montgomery, which ended with an assault on the participants and came to be known as “Bloody Sunday.”

Although every member of Alabama's congressional delegation voted against the measure, it was overwhelmingly passed by Congress and signed into law by Pres. Lyndon Johnson on August 6, 1965. The law led to a surge in African American voting and office holding in Alabama and the rest of the South.