The rise of Grindelwald, as well as the presence of Voldermort in the Ministry, all seems similar to the rise of Hitler in Germany before World War II. The interrogation of suspected Muggle-borns, shipping them off to prison, in order to "purify" the wizarding race...this is the plight of the undesirables in the eyes of the Nazis, no? The Nazis interrogated and jailed political dissidents, then the artists, before moving on to the Jews...I wonder if J.K. Rowling designed the story this way on purpose.
Even Grindelwald's prison, Nurmengard--seems like a nod to Nuremburg.
PS: is Grindelwald a play on words of Grendel, the most evil entity in literature?
I can put all this together, true or coincidental as it may be; yet I don't understand the concept of Splinching.