Ministry of CLS History, In Brief

Ministry of Labour, Cooperatives and Social Welfare(MLCW) was established by a merger of the ministry of Labour (which was originally established on August 1946), Ministry of Cooperatives (which was originally established on November 20, 1967) and Ministry of Social Affairs (which was originally established on June, 1974)
have been respectively in charge of providing employment relation services, expanding and enhancing cooperatives and finally improvement and promotion of welfare and social security.
The ministry merging was a part of government program for reorganizing government ministry and integration of the executive body with a complementary or overlapped tasks.
The new ministry has same tasks and responsibilities of all three former ministries. 

Cooperative History In Iran:

Post-Revolution Cooperatives
The outburst of Islamic Revolution has changed public belief about cooperation. Revolutionary forces believed that revolution by itself is a manifestation of cooperation; they became excited of collective cooperation in the course of goods fair distribution during long-lasting strikes of the time and were inspired for future endeavors.
New waves of hope swim in the thought of statesmen, in legislation and the new Constitution. This time, cooperation was highlighted and introduced not only as a tool to meet common needs, but also a path towards economic development, a high criteria for employment generation and a leading sector among other economic sectors of the newly- established republic system of country.
Cooperative movement was incorporated in the Constitution and this laudable method which was once considered an economic approach, was credited with spiritual aspects. It manifested strong resolve of Islamic Republic of Iran for realization of economic justice and opened a new door to justice lovers. All reasons and trends of cooperative movement as the key economic sector of the country could be outlined in Articles 43 and 44 of the Constitutions.
Article 43 defines provisions for national economy to achieve objectives of social economic independence, deprivation and poverty eradication, satisfying human requirements in the course of development. Provision of decent job means for all, particularly for those who are able to work but have no access to its facilities in the form of cooperative through granting interest-free loans or any other legitimate way, which prevent from wealth accumulation by special groups, nor it allow government to turn into an absolute employer (Constitution, Article 43 & 44).
Article 44 of the Constitution stipulates that national economy falls into three public, cooperative and private sectors. It explicitly shows the importance of cooperative sector when it reads that public sector operation should be limited to a certain extent and that private sector is complementary to the two other public and cooperative sectors. The provisions specified for legal support of triple sectors’ ownership suggest the strength of cooperative sector and an emphasis on its development (ibid).

For more information check "Iranian Cooperatives History"