Question: What kind of criminal does Svetozar Ristovski and John Wayne Gacy have in common?

Context paragraphs:
John Wayne Gacy: John Wayne Gacy Jr. (March 17, 1942 – May 10, 1994) was an American serial killer and rapist.  He sexually assaulted, tortured and murdered at least 33 teenaged boys and young men between 1972 and 1978 in Cook County, Illinois (a part of metropolitan Chicago).

When the Kite String Pops: When the Kite String Pops is the debut album of American sludge metal band Acid Bath.  Released on August 8, 1994, it is considered an underground classic.  The album's artwork is a painting made by notorious serial killer John Wayne Gacy while in prison awaiting execution, you can see that the balloons on the lower part contain both his nickname, "Pogo the clown", and his name, J. W. Gacy.  On the Double Live Bootleg!  DVD (2002), Dax Riggs introduced the song "Tranquilized" by saying, "This song is about getting high any way you do it, and kicking the earth from beneath you" and "Cheap Vodka" by saying, "This song is about getting wasted and killing things, blood, sex, and blasphemy."  "Toubabo Koomi" is Cajun French for "land of the white cannibals."  It was the only Acid Bath song that was made into a music video.  The song "God Machine" begins with a spoken word introduction by Dax Riggs.

Master of Brutality: Master of Brutality is the debut album by the Japanese stoner rock/doom metal band Church of Misery.  Five of the six tracks are based on and titled after infamous serial killers, Edmund Kemper, Peter Sutcliffe, Herbert Mullin, and John Wayne Gacy (portrayed on the cover).  The instrumental track "Green River" is inspired by serial killer Gary Ridgway.  The first track "Killifornia" contains audio of spoken words by Ed Kemper.  The artwork and booklet contains pictures and sketches of John Wayne Gacy; the back art has John Gacy dressed as "Pogo the Clown".

Mirage (2004 film): Mirage (Macedonian: Илузија ; transliterated "Iluzija") is a 2004 Macedonian drama film starring Vlado Jovanovski, Mustafa Nadarević, Nikola Đuričko, and Dejan Aćimović, with Marko Kovačević debuting in its lead role.  It was directed by Svetozar Ristovski, who co-wrote the film with Grace Lea Troje.  Taking place in the city of Veles, the film is a coming-of-age story about a talented but abused schoolboy who is betrayed by illusory hopes of a better future and transformed by harsh circumstances into a criminal.  It offers a grim depiction of post-independence Macedonia, portraying it as a site of violence and corruption.

Madonna Wayne Gacy: Stephen Gregory Bier Jr. (born March 6, 1964, Fort Lauderdale, Florida), formerly known by his stage name Madonna Wayne Gacy and by the nickname Pogo (John Wayne Gacy's clown name), is the former keyboard player for Marilyn Manson, from 1989 to 2007.  His stage name came from the names of the singer Madonna and the serial killer John Wayne Gacy.

The Mentally Ill: The Mentally Ill were a punk band originating from Deerfield, Illinois in the late 1970s.  Their legendary 1979 7" single Gacy's Place named after notorious serial killer John Wayne Gacy, is considered by many to be one of the most unusual records of the early Chicago punk rock scene.  They also released Sex Cells 7" and then dropped into obscurity.

Clyde Snow: Clyde Snow (January 7, 1928 – May 16, 2014) was a well-known U.S. forensic anthropologist.  Some of his skeletal confirmations include John F. Kennedy, victims of John Wayne Gacy, King Tutankhamun, victims of the Oklahoma City bombing, and Dr. Josef Mengele.

Gacy (film): Gacy is a 2003 direct-to-video biographical-drama film directed by Clive Saunders and written by Saunders and David Birke.  The story revolves around the life of serial killer John Wayne Gacy.

Svetozar Ristovski: Svetozar Ristovski (born January 26, 1972) is a Macedonian film director who now resides in Canada.  His first film was the 2000 short "Hunter" about the psychological study of a wartime sniper.  He marked his English language debut with 2010 "Dear Mr. Gacy" based on American serial killer John Wayne Gacy.  In addition to the awards he won for "Mirage", he also won the Golden Lily Award at GoEast for "Joy of Life" in 2002.

Dear Mr. Gacy: Dear Mr. Gacy is a 2010 Canadian drama thriller film directed by Svetozar Ristovski, starring William Forsythe and Jesse Moss.  The film is based on Jason Moss's memoir, "The Last Victim".

Supporting paragraphs: Svetozar Ristovski John Wayne Gacy
Answer: serial killer