John Wesley on Jude 1:8

In like manner these dreamers - Sleeping and dreaming all their lives. Despise authority - Those that are invested with it by Christ, and made by him the overseers of his flock. Rail at dignities - The apostle does not seem to speak of worldly dignities. These they had "in admiration for the sake of gain," Jude 1:16; but those holy men, who for the purity of their lives, the soundness of their doctrine, and the greatness of their labours in the work of the ministry, were truly honourable before God and all good men; and who were grossly vilified by those who turned the grace of God into lasciviousness. Probably they were the impure followers of Simon Magus, the same with the Gnostics and Nicolaitans, Rev 2:15. 2Pet 2:10.