According to rational Wiki:
the belief tying Sunday blue laws to Bible prophecy and the Antichrist appears to come from Ellen G. White's book The Great Controversy, specifically naming a universal Sunday law as the enforced taking of the mark of the beast that will unleash great persecution of Sabbath-keepers just before the Second Coming. The most notable attempt at passing a national blue law was in 1888, coincidentally or not the same year the third edition of The Great Controversy was released. The fourth and last edition in 1911, still containing this national Sunday law teaching, is still in circulation today. This fear of a coming national Sunday law became a conspiracy theory and something that must inevitably happen because, after all, Bible prophecy (or at least Ellen G. White's peculiar interpretation of it) says it will.
Several books cheaply printed for mass distribution continue to promote fear of a coming national Sunday law, among them National Sunday Law by A. Jan Marcussen and the anonymous National Sunday Law Crisis. Marcussen's book ties other issues into the conspiracy; for example, there is a conspiracy to bring back the death penalty so Sabbath-keepers can be executed once the national Sunday law is enacted. Marcussen's book has been mysteriously showing up since 1983 in laundromats, phone booths, rest areas, and unsolicited in the mail
So you know I am throwing away the book.
Just a note to say that I don't believe in the teaching of the Seventh Day Adventists however I do admire their work in the communities around Trinidad.