Might I add, that's how other conspiracy theories are made as well.
The above is how, for ages since the 5th century, how the Jewish people have become hated.
Aside from the charge of Deicide [which is not biblical (John 10:18, Acts 3:14-19, & 1 Corinthians 1:32)], xenophobia mixed with superstition created the condition for ethnic hatred against them.
They've suffered scorn, discrimination, marginalization, beatings, torture, eviction, and at times genocide, merely because they're Jews. They're human like any of us so they're fallible and yet have done nothing to, make credible, sensational accusations against them.
The most common form of accusation is Blood Libel (or Blood Liable) in which they are faulted for ills befallen upon the host people. If the plague hits the town, or a child gets sick; an army loses, or the crop fails then they must be behind it. After all, they do hate Christ and if they hate Christ they hate Christians so why wouldn't they be responsible?
When the time of expansion begun, as European states become industrialized, Zionist Conspiracy becomes popular. It is a belief that the Jews are not only responsible for the ills of the world but conspire to take over the world by any means covertly.
Thus, they are claimed to hijack banks, major industry, and even the media in order to influence the masses and create havoc to achieve world domination.
The most famous, rather infamous believer of it, is Hitler and the Nazis. Many Germans have already believed that lie but with the premature end of WWI and the unfair imposition of the Versailles Treaty, the Nazis exploited those ills to scapegoat the Jews. This ultimately led to the systematic mass murder of 5-6 million of Jews in Europe and Russia (another 6 million are political dissidents and homosexuals to ethnic undesirables such as the Gypsies).
Today, antisemitism is on the rise once again. Antisemites like Pastor Steven L Anderson to David Duke sought to lessen the number of how many were killed in concentration camps, claimed that the Zionists are really Khazars from the Asian Steppe, while regularly making conspiratorial and Blood Libel allegations.
Right now there is a legitimate worry amongst academics and others that, as the Jewish survivors of the concentration camps die out, antisemitism will increase at a greater pace. After all, they are living proof of the Holocaust, so when they die, so too will the world's intolerance for antisemitism.