I don't know whether angels fall under this category but if you mean spiriticism - "communicating with the spirits of the departed" then the catholic church sees a number of dangers in this practice and it has decreed:

"Where all

error

,

sorcery

, and invocation of the

demon

, implicit or explicit, is excluded, the mere use of physical means which are otherwise lawful, is not morally forbidden, provided it does not aim at unlawful or

evil

results. But the application of purely physical principles and means to things or effects that are really

supernatural

, in order to explain these on physical grounds, is nothing else than unlawful and

heretical

deception". This information was taken from the Catholic Encyclopedia.