Mapai
/maˈpʌɪ/noun
A left-wing political party in the state of Israel (formerly the British mandated territory of Palestine), formed in 1930 and becoming the major partner of the Israel Labour Party founded in 1968.
Origin
1940s. From modern Hebrew MP'Y (read as mapa'y), acronym from the initial letters of Miplegeṯ Pōʿălē 'Ereṣ Yiśrā'ēl Workers' Party of Israel.