Towards the end of July 1945 the Labour party in Britain was elected to power. The Yishuv leadership had high hopes that this would change the anti-Zionist policy that the British maintained at the time. However, these hopes were quickly dashed when the government limited Jewish immigration, with the intention that the population of Mandatory Palestine (the land west of the Jordan River) would not be more than one-third of the total. This, along with the stepping up of arrests and their pursuit of underground members and illegal immigration organizers led to the formation of the Jewish Resistance Movement. This body consolidated the armed resistance to the British of the Irgun, Lehi, and Haganah. For ten months the Irgun and the Lehi cooperated and they carried out nineteen attacks and defense operations. The Haganah and Palmach carried out ten such operations. The Haganah also assisted in landing 13,000 illegal immigrants.