Question: What was the name of the series which had an Southern Comfort film star playing an FBI agent?

Context paragraphs:
Southern Comfort: Southern Comfort (often abbreviated SoCo) is an American liqueur made from neutral spirits with fruit, spice and whiskey flavoring.  The brand was originally created by bartender Martin Wilkes Heron in New Orleans in 1874.  Since March 1, 2016 the brand has been owned by the Sazerac Company after being sold by the Brown-Forman Group.  Sazerac has announced that Southern Comfort's formula will be changed in 2017 to include whiskey as an ingredient, as it was until some time before the brand was sold to Brown-Forman in 1979.

Jack Ryan (FBI agent): John C. "Jack" Ryan (born 19 June 1938) is a former FBI agent and police officer.  He had been an FBI agent between 1966 and 1987 before being fired for refusing to investigate nonviolent activists.  He lost his job in September 1987 ten months short of retirement.  He was thus ineligible for a full pension and had to live in a homeless shelter.  In a report by the "LA Times", he stated his belief that the Bureau could reinstate him to a position which would not conflict with his personal beliefs that U.S. involvement in Central America is "violent, illegal and immoral."

Keith Carradine: Keith Ian Carradine (born August 8, 1949) is an American actor, singer and songwriter who has had success on stage, film and television.  He is perhaps best known for his roles as Tom Frank in Robert Altman's "Nashville", Wild Bill Hickok in the HBO series "Deadwood", FBI agent Frank Lundy in "Dexter" and US President Conrad Dalton in "Madam Secretary".  In addition, he is a Golden Globe- and Academy Award-winning songwriter.  As a member of the Carradine family, he is part of an acting dynasty that began with his father, John Carradine.

Southern Comfort (1981 film): Southern Comfort is a 1981 American action/thriller film directed by Walter Hill and written by Michael Kane, and Hill and his longtime collaborator David Giler.  It stars Keith Carradine, Powers Boothe, Fred Ward, T. K. Carter, Franklyn Seales, and Peter Coyote.  The film, set in 1973, features a Louisiana Army National Guard squad of nine on weekend maneuvers in rural bayou country as they antagonize some local Cajun people and become hunted.

Donnie Fatso: "Donnie Fatso" is the ninth episode in the twenty-second season of the American animated television series "The Simpsons".  It first aired on the Fox network in the United States on December 12, 2010.  The plot revolves around an FBI agent, who helps Homer go undercover to infiltrate Fat Tony's mob.  Homer agrees to this in hopes of decreasing his sentence after being charged for bribery.  This episode is a reference to "Goodfellas" as well as real-life FBI agent Donnie Brasco.

Rockmond Dunbar: Rockmond Dunbar (born January 11, 1973 in Berkeley, California) is an American actor.  He is best known for his roles as Baines on the NBC series "Earth 2", Kenny Chadway on Showtime's "Soul Food", and Benjamin Miles "C-Note" Franklin on the FOX crime drama "Prison Break".  He also played Sheriff Eli Roosevelt on the FX Drama series "Sons of Anarchy", FBI Agent Dennis Abbott on "The Mentalist", and FBI Agent Abe Gaines in the Hulu series "The Path".

Second Spring: Second Spring is the 1970 album by country rock/folk rock musician Ian Matthews' band Matthews' Southern Comfort.  It was Matthews's second album after his departure from Fairport Convention and was recorded with the touring band he put together following the release of his first solo LP, "Matthews' Southern Comfort".  It was released on the Uni label in July 1970.

John Vaughn Blake: John Vaughn Blake (1888 – June 29, 1964) was a former American football player and FBI agent.  He played football for Dan McGugin's Vanderbilt Commodores football teams with his brothers Dan and Bob.  Dan, Bob, and Vaughn were captains of the 1906, 1907, and 1908 respectively.  Vaughn was an end on the football team, selected All-Southern in 1908.  He was later an FBI agent involved with the capture of Alvin Karpis.

Joseph D. Pistone: Joseph Dominick "Joe" Pistone, alias Donnie Brasco, (born September 17, 1939), is a former FBI agent who worked undercover for six years infiltrating the Bonanno crime family and to a lesser extent the Colombo crime family, two of the Five Families of the Mafia in New York City.  Pistone was an FBI agent for 27 years.

Matthews' Southern Comfort (album): Matthews' Southern Comfort is the debut solo album by country rock/folk rock musician Ian Matthews, and was his first album after leaving Fairport Convention in 1969.  The musicians who played on it with Matthews were luminaries of the British folk rock scene and included ex-Fairport colleagues Ashley Hutchings, Simon Nicol and Richard Thompson, plus Gerry Conway, the drummer from Eclection and Fotheringay.  The touring and recording band Matthews Southern Comfort who went on to release two more albums, "Second Spring" and "Later That Same Year", would not be formed till later, with only pedal steel player Gordon Huntley and Matthews appearing on all three albums.  The album was released on the Uni label (a subsidiary of MCA Records) in January 1970 simultaneously with a first single "Colorado Springs Eternal", and took its name from a song, "Southern Comfort", by Canadian folk duo Ian and Sylvia (Tyson), which eventually appeared as the final track on "Second Spring".

Supporting paragraphs: Southern Comfort (1981 film) Keith Carradine
Answer: Dexter