Any person may be made a defendant who has or claims an interest in the controversy, or any part thereof, adverse to the plaintiff, or whom it is necessary, for a complete determination or settlement of any question involved therein, to make a party. (See General Statutes § 52-102 and annotations.)
Section 9-6.—Interested Persons as Defendants
Current through August 12, 2025 (2026 Practice Book edition) · Last verified July 9, 2026
In one sentenceAnyone who claims or has an interest adverse to the plaintiff in a case, or whose presence is necessary to fully resolve the dispute, may be made a defendant.
Full Text of Section 9-6
Amendment History
(P.B. 1978-1997, Sec. 85.)
Plain-English Summary
Section 9-6 allows any person who has or claims an interest in the controversy — or any part of it — adverse to the plaintiff to be made a defendant. It also allows a person to be added as a defendant if that is necessary for a complete determination or settlement of any question involved in the case.
Frequently Asked Questions
Who can be added as a defendant under this section?
Anyone who has or claims an adverse interest in the controversy, or any part of it, or whose addition is necessary to fully determine or settle a question in the case.
Does the interest have to cover the whole case?
No. The rule covers a person with an adverse interest in the controversy or in any part of it.
How does this differ from Section 9-3's treatment of plaintiffs?
Section 9-3 addresses interested persons joining as plaintiffs and what happens when a would-be plaintiff refuses to join, while Section 9-6 covers adding interested persons as defendants instead.
Source & verification. The section text is reproduced verbatim from the
official Connecticut Practice Book (Conn. Practice Book § 9-6). Prescribed by the Judges of the Superior Court of Connecticut (Conn. Gen. Stat. Section 51-14). The plain-English summary is original and written by us. Last verified July 9, 2026. ·
Official source
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