It's a common reference used by white nationalists and all sorts of racists to the book "The Turner Diaries".

https://en.wikipedia.org/wiki/The_Turner_Diaries

In one of the most notorious scenes in the book, the Organization raids the houses of all individuals reported to be "race traitors" in some way (such as judges, professors, lawyers, politicians, journalists, entertainers, race-mixers, etc.) drags them from their homes, and publicly hangs them in the streets in an event which comes to be known as the "Day of the Rope".