Those people also founded the Black colleges to appear as do-gooders, but they were connected to medical experimentation, and it seems they needed an unsuspecting farm of Guinea pigs. They were eugenicists, not do-gooders.
Seeking by a familiar spirit is anathema to God (examples: "blessed mother", "sacred hearts", angels).
Christ Jesus taught to pray to the Father, who is in Heaven.
'The meaning of "to pray" is "to ask".
Asking (praying) any other entity in Heaven to intercede is disobeying Christ, and opening one to demonic activity.
(NOTE: Though angels were sent from Heaven by God to speak to men, NONE of those Saints anywhere in Scripture INVOKED them.