Many lost generation artist were communists.
1) The decline of the American Dream in the 1920s
2) The Hollowness of the Upper Class
3) The Valley of Ashes
I hope that's help !
In Anne of Green Gables, Anne promises Diana she'll write Tuesday night. Diana promises to haunt the post office to wait for the promised letter.
Haunt, in this context, is meant "to linger". It means to frequent a place, or be relentlessly present.