The regimes of nazi germany fascist italy and the stalinist soviet union all shared a

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The major similarity between the nazi Germany (commanded by Adolf Hitler), the fascist Italy (led by Mussolini) and the Soviet Union (with the command of Stalin) was the authoritarianism of their governs. In all these countries the government had the absolute power and don't allow any opposition to grow up.

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They all shared an alliance called the triple entente.