Marx knew Plato

Pythagoras, through both his legend and his doctrine, had great influence on Platonism, but Plato himself says little about magical practices. That he believed in astrology and other forms of divination is strongly suggested by the Timaeus, and it is reasonable to assume he believed in daemons from what we know of the Platonic School tradition. In his Laws (933a-e) he takes healers, prophets and sorcerers for granted. These practitioners existed in Athens and no doubt all other Greek cities, and they had to be reckoned with and controlled by laws. Plato does add that one should not be afraid of them, their powers are real, but they themselves represent a rather low order of humanity.

https://www.faculty.umb.edu/gary_zabel/Courses/Phil%20281b/Philosophy%20of%20Magic/World%20Soul/Magic%20in%20the%20Graeco-Roman%20World.html