Abduction and kidnapping

Abduction and kidnapping seems to be the most common theme between the various groups.
A kidnapping is the unlawful act of capturing and carrying away a person against their will and holding them in false imprisonment.

Abductees

Mid-section survivors

Abductee	Abducted by	Date of abduction (post-crash timeline)	Reason for abduction	Status
Sayid	Danielle	Day 12 "Solitary"	Information Companionship	Released
Claire	Ethan	Day 16 "Raised by Another"	Safe delivery of baby Implant Claire	Escaped, with assistance, with memory loss
Charlie	Ethan	Day 16 "Raised by Another"	Warning for survivors	Hanged but ultimately survived
Walt	The Others	Day 44 "Exodus, Part 2"	Experiments Bargaining chip	Returned "safely" in exchange for some members of the A-Team and Hurley
Michael	The Others	Day 52 "Three Minutes"	Information Capture and bring to the Others several survivors	Made a deal with the Others to be released
Kate	The Others	Day 52 "Three Minutes"	Leverage (used as a hostage to get Jack, Locke, and Sawyer to relinquish weapons)	Released in exchange for weapons.
Sun	Charlie	Day 57 "The Long Con"	Make Locke appear like a fool	More or less escaped
Hurley	The Others	Day 67 "Live Together, Die Alone, Part 1"	Messenger	Released shortly after being captured
Kate	The Others	Day 67 "Live Together, Die Alone, Part 1"	Experiments Used to manipulate Jack	Escaped with the help of Alex, Karl and Juliet
Sawyer	The Others	Day 67 "Live Together, Die Alone, Part 1"	Experiments Used to manipulate Kate	Escaped with the help of Alex, Karl and Juliet
Jack	The Others	Day 67 "Live Together, Die Alone, Part 1"	Cure Ben's tumor Experiments	Made a deal with the Others to get off the island but is ultimately left behind Has rejoined the survivor's camp
Sayid	The Others	Day 80 "The Man from Tallahassee"	To prevent him from rescuing Jack	Was held prisoner in the barrack's playground. Has since returned to survivor's camp
Kate	The Others	Day 80 "The Man from Tallahassee"	To prevent her from rescuing Jack	Was held prisoner in Tom's basement Was gassed and dragged into the jungle with Juliet Has since returned to survivor's camp

Tailies

Abductee	Abducted by	Date of abduction (post-crash timeline)	Reason for abduction	Status
Blond Guy, Eli, Jim, Curly-Haired Guy, German Tailender, two unnamed Tailies	The Others	Day 1 "The Other 48 Days"	Unknown	Unknown
Emma Zack	The Others	Day 12 "The Other 48 Days"	Experiments Unknown	Have joined the Others community, mainly under the care of Cindy.
Nancy	The Others	Day 12 "The Other 48 Days"	Unknown	Unknown
Cindy	The Others	Day 48 "The Other 48 Days"	Experiments Unknown	Has joined the Others community.

Others

Abductee	Abducted by	Date of abduction (post-crash timeline)	Reason for abduction	Status
Alex	Ben	Pre-crash (1988) "Solitary"	Unknown Was adopted by Ben	Discovered that Danielle Rousseau was her mother. She had left the others and joined the survivor's camp. Has been murdered by Keamy.
Ben	Danielle Survivors	Day 58 "One of Them"	Information	Released by Michael and escaped
Mikhail	The A-Team	Day 77 "Enter 77"	Information Bargaining chip	Locke wanted to use Mikhail as a barganing chip when they reached the barracks. Pretended to die at the sonic barrier Has since actually died.
Ben	Jack	Day 93 "Through the Looking Glass, Part 1"	Information Revenge for supposedly killing Jin, Bernard, and Sayid	Chose to hide in the barracks from the freighter crew Was kept a prisoner in his own basement Fled the barracks after the mercenary attack Is currently with Locke and Hurley searching for Jacob's cabin.
Alex	Keamy	Day 97 "Meet Kevin Johnson"	To be used as a barganing chip for Ben	Was intercepted on her way to the temple. Was shot by Keamy at the barracks in front of Ben.

Kahana crew

Abductee	Abducted by	Date of abduction (post-crash timeline)	Reason for abduction	Status
Naomi	The A-Team	Day 85 "Catch-22"	They rescued her from a tree after her helicopter crashed. Information Satellite phone	They eventually nursed Naomi back to health and used her satellite phone to contact the Kahana. Promised the survivors rescue Was murdered by Locke
Charlotte	Locke	Day 91 "Confirmed Dead"	To keep hidden from the rest of the Kahana crew. Information	Was taken to the Barracks by Team Locke Was traded for Miles Is currently living with Team Jack
Miles	Locke	Day 92 "The Economist"	Traded by Sayid to Locke for Charlotte Information	Was held captive by Locke in the boat house Was questioned by Kate Left the Barracks when the mercenaries arrived. Is currently with Sawyer and Aaron

Unanswered Questions

Unanswered questions
Do not answer the questions here. Keep the questions open-ended and neutral: do not suggest an answer. More details...

For fan theories about these unanswered questions, see: Abduction and kidnapping/Theories

• Why did the Others kidnap members of the Tailies?
• Why did the Others really kidnap the children?
• Why did Claire lose her memory of being taken by Ethan?