Tying oneself spiritually to a tzadik [i.e. saint]. It occurs to me that I might have written about this in the past in light of the idea of Reb Chaim from Voloshin [the disciple of the Gra] that this type of thing is idolatry.
What bothers me is that the way this is understood by some people is to change the focus of Torah from being around God to being around a person.
But I see this at least as a flaw in the system that should be openly corrected --that is it should be stated publicly that the purpose of serve towards God is to do God's will and not to be tied to a tzadik.