The Jewish Encyclopedia further clarifies this concept:
... the rabbis say: "Never will the throne of God—the Lord of Truth, Justice, and Love—be fully established until the seed of Amalek—the principle of hatred and wrongdoing—be destroyed forever (Pesiḳ., l.c., and Targ. Yer. I. and II. to Ex. l.c.). Henceforth "Amalek" became the popular term for Jew-hater. (Jewish Encyclopedia, "Amalek")
We will get back to that thought on "Amalek" becoming "a popular term for 'Jew'-hater" but now that we know of the rabbinic mandate to exterminate Amalek as a condition for Judaic "redemption," we need to identify who exactly Amalek is. Who is it that the rabbis say it's necessary to exterminate.
Biblical Scripture speaks of Amalek as a tribe that waged war with the Israelites of whom God said, "I will destroy the memory of Amalec from under heaven" and of whom Moses wrote, "...the hand of the throne of the Lord, and the war of the Lord shall be against Amalec, from generation to generation." (Exodus 17;14-16) Needless to say, this is a far cry from Christ's teaching to love one's enemies, but such was the state of things prior to the true redemption through Christ's sacrifice on the cross.
But regarding the extermination of Amalek, Scripture indeed records that Amalek was completely destroyed to the last man in 1 Chronicles, 4;43, "And they slew the remnant of the Amalecites, who had been able to escape, and they dwelt there in their stead unto this day." This is circa 500 B.C.
Now, we have seen the quotation from the Zohar which dates circa 1300 A.D. which mandates the extermination of Amalek as a condition for Judaic redemption, but we have also seen from the Bible that Amalek was completely exterminated at the time of King David, more than 500 years before Christ. Therefore God's curse against Amalek has had no valid application for over 2500 years. Yet, the rabbis continue to wage war against foes they brand as "Amalek" 2500 years after Amalek was completely wiped out by true Israel.
There are many things to learn about the rabbinic tradition from this example. First, the fact that Amalek has been nothing but a memory for 2500 years doesn't discourage the rabbis from misappropriating and resuscitating the curse against Amalek for their purposes. Certainly, the usefulness of a curse as harsh as that placed upon Amalek--complete extermination under divine mandate--is stuff the rabbis salivate for. So, as usual, the rabbis turn Scripture upside down, in this case by drudging up a curse which Scripture itself put to rest 2500 years ago.
Secondly, we can see what machinations impatience inspires while waiting for over 1000 years for a "redemption" that will never come. The rabbis figure that since the "redemption" has not yet occurred, it must be because Amalek has not been completely wiped out yet, even though Scripture states quite plainly that Amalek was completely wiped out circa 500 B.C.
Thirdly, a vengeful, warlike people who believe in reincarnation are likely to see ancient enemies in populations presently living. The rabbis do preach reincarnation (gilgul) and they do preach eternal vigilance and vengeance against "Amalek."
Getting back to the rabbis' misapplication of "Amalek" and it's associated curse of annihilation upon those deemed "'Jew'-haters," which in reality most often means someone that the rabbis hate. Many individuals and populations have been misidentified by the rabbis and Judaic organizations as "Amalek" and slated for extermination throughout history. Some examples, in no particular order, are Rome, Christendom, Armenians, Germans, Arabs, Palestinians, revisionist historians, and noteworthy today, Persians/Iranians.
There is a rabbinic myth which identifies Haman from the book of Esther as a descendant of Amalek. This Purimspiel creates a false association between Amalek and people of Persian descent as the story of the Book of Esther takes place in Persia, today's Iran, which Zionist warmongers have been pushing to attack unprovoked for several years now. To those of a Kabbalistic bent, Iranian President Ahmadinejad is viewed as the reincarnation of Haman who was mythologized as a descendant of Amalek.
For further information on the Judaic misuse of the epithet, "Amalek," watch the following video: