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An inquisitor was an official (usually with judicial or investigative functions) in an inquisition – an organization or program intended to eliminate heresy and other things contrary to the doctrine or teachings of the Catholic faith. Literally, an inquisitor is one who "searches out" or "inquires" (from the Latin inquirere).
There exist archaic female forms of the word. "Inquisitrix" was used in the early 1800s, and its predecessor "inquisitress" was used in the early 1700s.
In some cases, inquisitors sought out the social networks that people (allegedly) used to spread heresy.
There were multiple national inquisitions with different approaches and targets.
By extension, the term "inquisitor" sometimes refers to interrogators not connected with the Catholic church — for example, to zealous NKVD functionaries in the Soviet Union.
In the Albigensian Crusade a second-hand story arose that inquisitor and general Arnaud Amalric at the storming of Béziers advocated general slaughter, saying “Kill them. For God knows who are his.” Amalric's own report to the Pope was that his troops jumped the gun and took over the town violently before he was aware.
Some of the better-known and notable inquisitors throughout history include:
One of the saddest aspects of Piatakov's case was that Stalin's inquisitors succeeded in using against him none other than his wife and Moskalev, his closest friend. [...] The NKVD inquisitors easily and quickly broke Piatakov's wife. [...] I was convinced that if [...] there was one man strong enough to withstand the pressure of Stalin's inquisition, that man would be Piatakov. For a long time, indeed, he refused even to talk to his inquisitors.