One of the versions for Arlozorov's 1933 murder (not solved to this day!) is that it had something to do with his early friendship with Magda Goebbels. This is what wikipedia says, soberly hedging its description:
During the first world war, Magda Behrend, who later became the wife of Joseph Goebbels, met and became close friends with Lisa Arlosoroff, Haim Arlosoroff's sister. The nature of her relationship with Haim Arlosoroff is unknown. Magda married Goebbels on 19 December 1931, with Adolf Hitler as a witness. A year and a half later, Arlosoroff went to Germany to negotiate the Ha'avarah (transfer) agreement with high Nazi officials. The theory is that with Haim Arlosoroff's personal involvement in the negotiations, Goebbels took notice of his wife's former Jewish friend and sought to erase what might have been an embarrassment for the Goebbelses.
This is actually a very murky issue, so I'd like to try and take a baby step here - is there documentary evidence that Goebbels actually knew his wife used to be friends with Arlozorov? Or did she hide this fact from him?
I am thinking that perhaps diaries and/or memoirs might be able to throw light on this angle.