A major land reform was also conducted, led by Wolf Ladejinsky of MacArthur's SCAP staff. Between 1947 and 1949, approximately , or 38% of Japan's cultivated land, was purchased from the landlords under the government's reform program, and was resold to the farmers who worked them. By 1950, 89% of all agricultural land was owner-operated and only 11% was tenant-operated. MacArthur's efforts to encourage trade union membership met with phenomenal success, and by 1947, 48% of the non-agricultural workforce was unionized. Some of MacArthur's reforms were rescinded in 1948 when his unilateral control of Japan was ended by the increased involvement of the State Department. During the Occupation, SCAP successfully, if not entirely, abolished many of the financial coalitions known as the Zaibatsu, which had previously monopolized industry. Eventually, looser industrial groupings known as "Keiretsu" evolved. The reforms alarmed many in the U.S. Departments of Defense and State, who believed they conflicted with the prospect of Japan and its industrial capacity as a bulwark against the spread of communism in Asia.