You could argue that the Yoshida government from 1949 through the early 1950's was pretty repressive--with MacArthur's blessing, of course:
"...On 22 July 1948 MacArthur personally settled the rift in headquarters over revising the National Public Service Law in favor of the conservative opponents of allowing government employees to strike or bargain collectively. MacArthur's statement was immediately seized upon by the private sector as a warning against all strike activity and led to sharply constricted labor union activities.
"No doubt seeking one way to reestablish his bona fides with the core of his conservative supporters at home, early in 1949 MacArthur reversed his position that the Communist threat to Japan had become merely "a nuisance factor" and actively collaborated with the Japanese government in repression of the Left.125 Coinciding with the labor unrest precipitated by the Dodge austerity plan, SCAP officials advocated a purge of Communists from the public payroll and raised no objection to Diet restrictions on labor union rights. In his 1949 Fourth of July message, MacArthur first made the suggestion that the Japanese Communist party might be outlawed. When Prime Minister Yoshida submitted a draft of a September speech for review by MacArthur, the general noted in the margin, "Entirely unobjectionable," to the section which read "we must combat communism, which under alien instigation seeks to create confusion and destroy social order by deceit and intimidation. We should boldly confront and overcome this sinister force.'
"Paralleling the rise of Senator Joseph McCarthy and his Republican allies to prominence in the United States, MacArthur and the Japanese government followed up on the idea of overcoming the sinister force of communism in the months just before and after the Korean War. The main Korean organization in Japan, where the Korean population was overwhelmingly left-wing, was forced to dissolve. In May 1950 MacArthur ordered the Yoshida cabinet to purge the entire Central Committee of the Japanese Communist party and seventeen editors of the party daily, Akahata. The start of the Korean War triggered even more severe repression. Instigated by Government Section, the Japanese government's Red Purge resulted in about 22,000 Japanese being removed from public life. '..."
https://books.google.com/books?id=0O7nID3qgaEC&pg=PA83
"The tough budgetary and personnel programs of the Dodge Line in 1949 and 1950 led to tension and violence in the Tokyo area, the epicenter of political shocks in Japan. The government and the private sector discharged thousands of working personnel and, with SCAP approval, took a number of repressive measures against liberal and left-wing elements in politics, the media, and the labor movement..."
https://archive.org/stream/bub_gb_TZHK6GU_LmgC#page/n251/mode/2up
In 1952, a left-wing but not Communist Japanese political scientist, Masao Maruyama, could write that "the Liberal party government of Japan" showed "marked tendencies towards fascism" though admittedly it was "more 'moderate'" than "the regimes of Syngman Rhee, Quirino, Bao Dai, and Chiang Kai-shek."
https://archive.org/stream/in.ernet...n-Modern-Japanese-Politics#page/n183/mode/2up