Hebrew translation:

(white text at top)

Don't send your vote into empty space!

(black text at bottom)

Chose the Workers' Party of the Land of Israel (Mapai)

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Curator's Note: The symbols on the rocket are the Hebrew voting letters of various Israeli political parties such as Herut, General Zionists, etc. The publisher of the poster, the Mapai party, playing on the then-current "space race" between the US and the USSR is saying that votes for those parties are wasted. At that time Israel was experimenting with rocketry and had just launched its first rocket, a meteorological research missile, the Shavit 2. DJW