• jarāsandhaḥ — Jarāsandha
  Jarā (the old woman) + sandha (joined). Born in two halves and joined by the demoness Jarā. King of Magadha, Kaṁsa's father-in-law. He invades Mathurā seventeen times in SB 10.50–52 and is finally killed by Bhīma.
• dvividaḥ — Dvivida
  The monkey-demon, brother of Mainda. He befriended Naraka and ravaged the earth. Balarāma kills him in SB 10.67 — Gauḍīyas note this as a Balarāma-only victory, a quiet sphere of His independent action.
• śambaraḥ — Śambara
  The demon who, alarmed by a prophecy of his own, stole infant Pradyumna and was eventually killed by him in SB 10.55. The same prophecy-fear that drives Kaṁsa drives Śambara — the asura type is repeatable.
• narakaḥ — Naraka
  Narakāsura, the son of Bhū-devī, who tormented the demigods until Kṛṣṇa killed him at Prāgjyotiṣapura (SB 10.59), liberating the sixteen thousand princesses.
• bāṇaḥ — Bāṇa
  Bāṇāsura, devotee of Lord Śiva, possessor of a thousand arms. Defeated by Kṛṣṇa in SB 10.62–63 in the war over his daughter Uṣā and Aniruddha.
• kṛta - sauhṛdāḥ — having made friendship (with me)
  Kṛta (made) + sauhṛda (friendship, lit. 'good-heartedness'). The friendship is named precisely so that the Bhāgavatam can later show its instability: each of these 'friends' falls separately, none rescues Kaṁsa, and even Jarāsandha cannot save his son-in-law.

• What 'demonic saṅga' do you maintain whose collective effect on you is undeniable?
• Whose devotional company could replace it if you chose?

Kaṁsa lists his allies: Jarāsandha, Dvivida, Śambara, Naraka, Bāṇa. The Bhāgavatam files them for later use — every one of these names will appear in a later chapter of Canto 10 or 11 as a demon Kṛṣṇa kills, displaces, or domesticates. Kaṁsa's friend-list is the Lord's to-do list.