I read of a local satanic assembly that actually held all night prayer services, praying against the pastor of one church. This cult met in a house located directly behind the church. They even sent letters to the church telling them of their evil practice. The pastor, a great pulpiteer, soon left his wife. The Satan worshipers then left the area (Merida, Tony. Faithful Preaching (pp. 146-147). B&H Publishing. Kindle Edition).