Its a group that claims to be muslim, yet worships men instead Of Allah. They do all kind of weird things, Like grave worship, asking from the dead, saint worship and all heretical things. A muslim is one who believes in One God, and asks help only from him (in the matters of unseen) and doesnt equate to him partners. The shias do all this.
Do they Worship every man or just a group of men, that's be weird if they Worship men