The Lord's Day Observance Society.  Something here is not right.  They write:

The Divine Authority and perpetual Obligation of the Christian Sabbath or Lord's Day, and that in asserting the obligation of the Lord's Day, the gospel of the Grace of God through Christ Jesus should be proclaimed 

Hear is my take on it (Yes, I intended to write 'hear' not 'here').  Click the link and you will know why.