Grappa was a Hutt criminal who lived on Genon. At one point, he owned the starship Moldy Crow and employed the smuggler Roark Garnet. After the final death of Galactic Emperor Palpatine in 11 ABY, Grappa allied himself with the Imperial Ruling Council and its two leaders, Carnor Jax and Xandel Carivus. He helped supply the latter with bounty hunters and was engaged in business dealings with Boss Banjeer. He was also involved with Nom Anor. He kidnapped Feena D'Asta and had her replaced with a clone.