Giacomo Costa (14 December 1919 - 22 January 2000) was an Italian Australian professional wrestler best known by his ring name, Al Costello. Costello was the first professional wrestler to be nicknamed "The Man of a Thousand Holds" because of his innovative and very technical style. Costello was the creator and original member of the tag team The Fabulous Kangaroos, whose "Ultra Australian" gimmick complete with boomerangs, bush hats and the song "Waltzing Matilda" as their entrance music, existed in various forms from 1957 until 1983. Costello was either an active wrestler, or a manager in all versions of The Fabulous Kangaroos.

For years, Al Costello had been working on an idea for a new tag team; he even knew who he wanted for a partner: a wrestler he had worked with some years ago named Roy Heffernan. Because Costello and Heffernan had lost touch over the years, the idea remained dormant until Costello toured Hawaii in 1956. Costello mentioned his idea of an "Ultra Australian" tag team to fellow wrestler, and future promoter, Joe Blanchard. Blanchard happened to be a good friend of Roy Heffernan and knew he was working in Stampede Wrestling at the time. Blanchard put the two in touch with each other, and Costello was soon off to Calgary, Alberta, Canada to join Heffernan and finally make his tag team a reality. Costello and Heffernan debuted as "The Fabulous Kangaroos" on 3 May 1957 for Stu Hart's Stampede Wrestling promotion in a match against Maurice LaPointe and Tony Baillargeon. Only weeks after that first match, The Kangaroos were working with the top tag teams in the promotion. After working in Stampede for a while, The Fabulous Kangaroos started to travel across the United States, headlining shows wherever they went due to their ability to rile up crowds with their heel (bad guy) tactics. On one occasion in August 1958, The Kangaroos, or "Kangaroo Men" as they were billed, nearly caused a riot in Madison Square Garden during a match against Antonino Rocca and Miguel Perez; the fans began to throw fruit and stones at them. After the match ended without a decisive winner, the promoters stepped in, turned up the arena lights, and played the National Anthem to stop a potential riot. This was a common tactic used at the time by the New York promoters in order to prevent riots and help the heels leave the arena unharmed. Later that year, Costello and Heffernan started working for Dory Funk's NWA Western States promotion based in Amarillo, Texas. Here, The Kangaroos won their first title as a team when they defeated Pepper Gomez and El Medico to win the Texas version of the NWA World Tag Team Championship on 17 November 1958. Their first title reign was short lived, however, as Gomez and Rito Romero defeated them to regain the titles two weeks later. Between 1957 and 1965, The Kangaroos wrestled in the United States, Canada, Asia and select tours of Australia and New Zealand. They worked for such companies as Capitol Wrestling Corporation (the future World Wrestling Entertainment), Championship Wrestling from Florida, NWA Ohio, the Japan Wrestling Association and the World Wrestling Association in Los Angeles, California. The Kangaroos never forgot their roots and continued to work in Canada off and on through the years; in addition to Stampede Wrestling, the team also worked for NWA All-Star Wrestling based in Vancouver, British Columbia. Costello featured in a National Film Board of Canada short subject La Lotta/Wrestling/Le Catch. Their stint in NWA All-Star Wrestling was the last time Costello and Heffernan teamed together. In June 1965, The Kangaroos lost to Don Leo Jonathan and Jim Hardy and then split up. Heffernan had left Australia to tour the world in 1953 and wanted to return to his homeland, while Costello was determined to remain in the United States for a while longer.

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Costello and Heffernan started working for Dory Funk's NWA Western States promotion based in Amarillo, Texas.