Porfirio Rubirosa Ariza (January 22, 1909 – July 5, 1965) was a Dominican diplomat, race car driver, soldier and polo player.
 He was an adherent of the dictator Rafael Trujillo, and was also rumored to be a political assassin under his regime.
 Rubirosa made his mark as an international playboy for his jetsetting lifestyle and his legendary sexual prowess with women.
 Among his spouses were two of the richest women in the world.
Barry Maessen (born November 12, 1976 in Ysselsteyn) is a Dutch racecar driver.
 Maessen is the son of BriSCA F1 racer, circuit developer and entrepreneur Harry Maessen.
 The Dutch driver will be the first Dutch racing driver in the NASCAR Whelen Euro Series.
George Barringer (May 2, 1906 – September 2, 1946) was an American racecar driver from Wichita Falls, Texas active during the 1930s and 1940s.
 Barringer made 17 Championship Car starts with a best finish of second at Springfield in August 1935 and Milwaukee in August 1939.
 It was in 1941 that Barringer would debut a revolutionary rear engine racecar at the Indianapolis 500, unfortunately, he would only place 32nd after a garage fire destroyed the car before the race began.
 He and George Robson were killed in the same multi-car pile-up at the Lakewood Speedway in Atlanta, Georgia.
Alan Dennis Kulwicki (December 14, 1954 – April 1, 1993), nicknamed "Special K" and the "Polish Prince", was an American NASCAR Winston Cup Series (now Monster Energy NASCAR Cup Series) racecar driver.
 He started racing at local short tracks in Wisconsin before moving up to regional stock car touring series.
 Kulwicki arrived at NASCAR, the highest and most expensive level of stock car racing in the United States, with no sponsor, a limited budget, and only a racecar and a borrowed pickup truck.
 Despite starting with meager equipment and finances, he earned the 1986 NASCAR Rookie of the Year award over drivers racing for well-funded teams.
Robert "Bobby" Santos III (born October 3, 1985 in Massachusetts) is an American racecar driver from Franklin, Massachusetts.
 He graduated in 2004 from Tri-County Regional Vocational Technical High School.
 Santos, nicknamed "Bobby New England", is the grandson of Bobby Santos, a former modified racer.
 His sister, Erica Santos, is also a racecar driver.
 He is the cousin of former University of New Hampshire quarterback Ricky Santos.
Harold Homer "Jack" Petticord (21 November 1900 – 2 January 1940) was an American racecar driver, born in Wichita, Kansas.
 He drove for the Essex racing team in 1922 and 1923, as well as for the Boyle Valve racing team in 1927.
 Primarily a dirt track racer, Petticord made starts in both IMCA Big Cars and AAA Championship Car including the 1927 Indianapolis 500.
 He also served as a relief driver later in that race for Al Melcher and then the next year was a relief driver for Ira Hall.
 In 1934, he again attempted to qualify for the Indy 500 but failed to do so.
 He failed to qualify in 1938 as well.
 He died in Chicago, Illinois and is buried in Highland Cemetery in Wichita, Kansas.
General Rafael Leónidas Trujillo Martínez (5 June 1929 – 27 December 1969 in Madrid, Spain), better known as Ramfis Trujillo, was the son of Rafael Leónidas Trujillo Molina (some historians, like Jesús Galíndez, claim that he adopted him, and that Ramfis was María Martínez’s son from her previous marriage).
 Like his close friend (and for a time brother-in-law) Porfirio Rubirosa, he was regarded by most as a reckless and spoiled playboy, though he is also remembered for his ruthlessness and cruelty.
 He took control of the Dominican Republic on 30 May 1961, after his father was assassinated.
Winning is a 1969 American motion picture starring Paul Newman and Joanne Woodward.
 The film is about a racecar driver who aspires to win the Indianapolis 500.
 A number of racecar drivers and people associated with racing appear in the film, including Bobby Unser, Tony Hulman, Bobby Grim, Dan Gurney, Roger McCluskey, and Bruce Walkup.
Robert James Bondurant (born September 8, 1978) is a former racecar driver competing the D1GP and the Formula D circuits as a part of the Drift Avengers.
 Bondurant has since retired from competition but still maintains an active website.
 He is also the grandson of legendary racecar driver Bob Bondurant and son of Bobby Bondurant.
Luis José Ramfis Domínguez-Trujillo (b. New York, 22 May 1970) is a grandson of Rafael Trujillo, who ruled the Dominican Republic from 1930 to 1961, through Trujillo’s predilect daughter: Angelita Trujillo.
 Domínguez-Trujillo currently aspires to the presidency of the Dominican Republic.

Question: Ramfis Trujillo was a close friend of the racecar driver and diplomat of what nationality?
Answer: Dominican