Question: Ed and Lorraine Warren were paranormal investigators who did what type of hunting?

Context articles: Haunted Towns
The Conjuring
Haunted Collector
The Conjuring (film series)
The Conjuring 2
Ghost hunting
Ed and Lorraine Warren
Perry DeAngelis
Annabelle (doll)
Extreme Paranormal

Haunted Towns is an American paranormal television series that premiered on August 15, 2017 in the United States on Destination America.
 The series features the "Tennessee Wraith Chasers", a group of professional paranormal investigators that are known for trying to "trap ghosts" during their investigations.
 "TWC" continue on their paranormal journey by traveling to the most haunted locations in the most haunted towns in America.
 The show airs on Tuesdays at 10 p.m. EST.
The Conjuring is a 2013 American supernatural horror film directed by James Wan and written by Chad Hayes and Carey W. Hayes.
 It is the first installment in "The Conjuring" series.
 Patrick Wilson and Vera Farmiga star as Ed and Lorraine Warren, paranormal investigators and authors associated with prominent cases of haunting.
 Their purportedly real-life reports inspired "The Amityville Horror" story and film franchise.
 The Warrens come to the assistance of the Perron family (Ron Livingston and Lili Taylor), who are experiencing increasingly disturbing events in their farmhouse in Rhode Island in 1971.
Haunted Collector is an American television reality series which airs on the Syfy cable television channel.
 The first season premiered on June 1, 2011, and ended on July 6, 2011.
 The series features a team of paranormal investigators led by demonologist John Zaffis, who investigates alleged haunted locations with the hopes of identifying and removing any on-site artifacts or "trigger objects" that may be the source of the supposed paranormal or poltergeist activity.
The Conjuring is an American horror film series distributed by the New Line Cinema division of Warner Bros.
 Pictures.
 The films present a fictional take on the real-life cases of Ed and Lorraine Warren, paranormal investigators and authors associated with prominent yet controversial cases of haunting.
 The main series follows their attempts to assist people who find themselves possessed by demonic spirits, while the spin-off films focus on the origins of some of the entities the Warrens have come across.
The Conjuring 2 is a 2016 American horror film directed by James Wan.
 The screenplay is by Chad Hayes, Carey W. Hayes, Wan and David Leslie Johnson.
 It is the sequel to 2013's "The Conjuring" and the third installment in "The Conjuring" series.
 Patrick Wilson and Vera Farmiga reprise their roles as paranormal investigators and authors Ed and Lorraine Warren from the first film.
 The film follows the Warrens as they travel to England to assist the Hodgson family, who are experiencing poltergeist activity at their Enfield council house in 1977 which later became referred to as the Enfield Poltergeist.
Ghost hunting is a pseudoscience wherein its adherents visit and investigate locations that are reported to be haunted by ghosts. Typically, a ghost hunting team will attempt to collect "evidence" that they see as supportive of paranormal activity.
 Ghost hunters often use a variety of electronic devices: the EMF meter; digital thermometer; handheld and static digital video cameras, such as thermographic (or infrared) and night vision; digital audio recorder; and computer.
 Traditional techniques such as conducting interviews and researching the history of a site are also employed.
 Some ghost hunters refer to themselves as a "paranormal investigator".
Edward Warren Miney (September 7, 1926 – August 23, 2006) and Lorraine Rita Warren (née Moran, born January 31, 1927) are a Roman Catholic couple who were highly controversial American paranormal investigators and authors associated with prominent cases of hauntings. Edward was a World War II United States Navy veteran and former police officer who became a self-taught and self-professed demonologist, author, and lecturer.
 Lorraine professes to be clairvoyant and a light trance medium who worked closely with her husband.
Perry J. DeAngelis (August 22, 1963 - August 19, 2007) was an American podcaster.
 He is best known for co-hosting the Skeptics' Guide to the Universe podcast, which he helped found.
 DeAngelis is known for his and Steve Novella's investigation into Ed and Lorraine Warren's ghost hunting claims.
 He was also co-founder and executive director of the New England Skeptical Society, and was very active in the skeptical movement and paranormal investigations until his death from scleroderma in 2007.
Annabelle is a Raggedy Ann doll alleged by demonologists Ed and Lorraine Warren to be haunted.
 The doll resides in a glass box at The Warrens' Occult Museum in Monroe, Connecticut.
 The story served as the inspiration for the films "Annabelle" (2014) and "" (2017).
 Annabelle has been compared to Robert the Doll and was described in Gerald Brittle's 2002 biography of Ed and Lorraine Warren, "The Demonologist".
Extreme Paranormal is an American paranormal documentary TV special that premiered on Monday, October 26, 2009 on A&E Network at 10pm EST.
 It aired as a two-part 1 hour special for Halloween and followed the missions of three paranormal investigators that go to extremes in order to make contact with spirits during their investigations.