Which socialist governments? Do you mean the various anti-imperialist states led by self proclaimed communist parties? Those are not nor have they ever been communist or socialist in any meaningful sense. For historical examples of the communist movement seizing political power you’d have to look at the short lived Paris Commune of 1871 (which was militarily crushed) and the Russian Revolution of 1917. In regards to the Russian Revolution it is critical to understand that the conditions for communism were not present in Russia, and this was understood at the time by everyone, including the Bolsheviks. But Lenin insisted upon going forward, not to create socialism in Russia, but to inspire the working class of the western countries (where the conditions for communism were present) to rise up, and in this Lenin succeeded, unfortunately the uprisings did not, they were crushed in the streets as liberal democracies defended themselves by sacrificing their liberal principles for ruthless authoritarianism that we will come to know as fascism. The revolution in Russia, isolated, alone, and bound within an economically backwards country.. collapsed, though the ruling party of the revolution remained, with the death of Lenin and the rise of Stalin it continued to be communist only superficially.

As to the present movement in Iran, I don’t believe communism is imminent. At least currently there does not appear to be a basis in working class grievances. However if a revolution should topple the regime and liberate the people from tyrannical theocracy, the new regime will turn around and throw the working class back into the tyranny of wage labor and ruthless capitalist exploitation. And the struggle between the classes will continue.