Communism and the wave of unbelief that followed was the Great Dajjal. The dajjal of Muslims, or the sufyan, was "Ataturk". According to Bediuzzaman, why would the gates of repentance still be open before the sun rises from the West if all the major signs come before that? because such things as dajjal, signs, etc. they are mostly symbolic or of a nature that is similar to things we see in this worldly life. Read the Fifth Ray on erisale.com in the book the rays for more info. EDIT: the Prophet (saws) often spoke of such things as when he did when he said "a boulder that has been rolling downhill for 70 years has crashed, and then they received news a hypocrite died.
One possible interpretation for the dajjal IS a literal person, another is a wave of unbelief, one possible interpretation of Isa (as) according to Bediuzzaman is a literal Isa (as) another is the cleansing of Christianity and defeating dajjalic systems together with the Muslims. (later risale scholars said this refers to America defeating communism)
EDIT: I did all my research, all these signs happened at the turn of the 20th century....look up a website called discoveringislam.org and a website for islamic hijri conversion for the Prophet (saw)'s given time frames.