Well Poisoning Accusations in Medieval Europe: 1250-1500
In late medieval Europe, suspicions arose that minority groups wished to destroy the Christian majority by poisoning water sources. These suspicions caused the persecution of different minorities by rulers, nobles and officials in various parts of the cont...
Rothschilds have been jewish since forever. If you mean they aren't religious Jews, that's true. If you mean that in order to do their evil they have to ignore and violate the law of Moses, that is also true. If you mean they probably have no ancestry to Abraham Isaac and Jacob, that is probably also true.
So in that way they aren't Jews in any meaningful sense of the word. We don't use any other religious label that way. The whole Kazarian thing is sketchy at best, the empire having basically disappeared a millennium ago.
And yet "loosh lizards" is an even more useless term and concept.