Socialism: Utopian and scientific

As background, let me cite the fact that in the Communist Manifesto of 1848, Marx and Engels had already differentiated Scientific Socialism from Utopian Socialism of three kinds:
PETITION FOR GRANT OF PERMANENT RESIDENCE TO PROFESSOR JOSE MARIA SISON
We, the undersigned, hereby petition the Dutch government , especially the Prime Minister and the Minister of Justice, to grant the permanent residence status to Prof. Jose Maria Sison. It is a matter of justice that he be granted the residence permit in view of the following:
