This goes a lot deeper than the 1940s.

It really begins with Herzl. Herzl himself said that antisemitism would help his cause, precisely because antisemitism would convince Jews that they had more of a chance of being successful outside of Europe than inside of Europe.

Hell, even Balfour (the Balfour declaration guy) was an antisemite, and thought that Zionism would

mitigate the age-long miseries created for Western civilization by the presence in its midst of a Body [the Jews] which it too long regarded as alien and even hostile, but which it was equally unable to expel or to absorb

He also thought that

We have to face the facts. Men are not born equal, the white and black races are not born with equal capacities: they are born with different capacities which education cannot and will not change.

With regards to disenfranchisement of black people in South Africa. This is the kind of people Zionists counted on for support.

You also have Zionist militias that would later become the IDF being sustained by Polish arms and training.

During the interwar period, as part of its policy of supporting a Jewish state in Palestine in order to facilitate mass Jewish emigration from its territory, the Second Polish Republic provided military training and weapons to Zionist dparamilitary groups, including Haganah.

Hell, even if we restrict ourselves to the 1940s you have the USSR under Stalin, a notorious antisemite, supporting Israel with diplomacy and Czechoslovakian weapons. The latter especially was crucial to their victory in the war against the Arab states.