Germany sent guns to the Hagana secreted in concrete barrels. The SS Army invited Zionist leaders to Berlin to help Jewish youth prepare for their transfer to Palestine. Worse, Zionist Pabel Polkas, representative for Hagana & immigration met with Eichmann & other SS Leaders (including Hagin) who he brought back to Haifa. Yes, both Eichmann & Hagin were guests in Palestine! Until the Mandate police learned who they were and they headed to Egypt. Eichmann was also a participant at the 20th Zionist World Conference. Why? Well their interests overlapped. Germany wanted the Jews out of Europe. Zionists wanted to create Israel in Palestine, win-win.
(Unless you're a Palestinian!)