It was formed in 1952 by an ideological split in kibbutz Ein Harod (founded 1921), with Mapam-supporting members forming Ein Harod (Meuhad) and Mapai-supporting members breaking away to create Ein Harod (Ihud), which joined the Mapai-affiliated Ihud HaKvutzot veHaKibbutzim. Today both kibbutzim belong to the same movement, the United Kibbutz Movement.
Ein Harod Ihud is Israel's first "green" kibbutz. The kibbutz has introduced a whole series of environmental projects. Recycling bins have been installed for sorting waste and an ecological garden is being planted based on a model developed by the Ministry of Environmental Protection and the Technion. The kibbutz is switching to environmentally friendly detergents and has distributed a list of products not tested on animals. An energy survey has been conducted to identify alternative energy sources in the kitchen, laundry and ironing room. Energy consumption is being cut by using energy-saving bulbs and air conditioners, and installing electricity meters in homes and public buildings. The Ministry of Agriculture has approved funding for research on energy efficiency in milk cooling.