In early 1920 Lenin decided to invade the newly restored state of Poland (sewn together from the collapsed empires of Imperial Germany, Austria-Hungary and czaristRussia).
The reason for such a raid follows the logic of the elders of Zion in CzaristRussia and now its Islamist followers: The Israeli Mossad was supposedly one of the crime's suspects, not based on any evidence, but on an unfounded anti-Semitic conspiracy theory.