Ljunggren was a member of the Rebels Motorcycle Club, which was formed in
Helsingborg in 1981. The Rebels were affiliated with the
Hells Angels chapter across the
Øresund strait in
Helsingør and, through this association, Ljunggren became acquainted with Hells Angels member
Jan "Face" Krogh Jensen. In 1984, Ljunggren founded the White Trash MC with Jensen and another Danish biker who had moved to Helsingborg, with the intention of eventually forming a Hells Angels chapter in Sweden. The White Trash became closely associated with the Black Sheep MC, a Hells Angels prospect club in
Roskilde which later became the Hells Angels' South chapter. Two Black Sheep members, including Jan "Clark" Jensen, took refuge with the White Trash in Helsingborg following the
Copenhagen Biker War. The White Trash also had good relations with Hells Angels in Helsingør and its then president Michael Garcia "Lerche" Olsen. The Helsingør Hells Angels chapter closed in the spring of 1986 following an internal dispute, however. The same year, police raided the White Trash's clubhouse while searching for Jan "Clark" Jensen and discovered weapons and stolen goods, which resulted in Ljunggren being sentenced to prison. The police operation and Ljunggren's imprisonment caused the White Trash to disband, and Ljunggren applied to return to the Rebels. He withdrew from the biker club scene following the birth of his second son in 1989 and, in 1991, spent time riding through the United States with his friend Lasse "Kalle Fist" Karlsson, another former Rebels member. Upon his return to Sweden, Ljunggren joined the Morbids MC, which had been formed in Helsingborg earlier that year. In 1993, a fight took place between the Morbids and the Rebels in
Stockholm, which left several Morbids members beaten. Some time later, the Hells Angels in
Malmö offered a path to membership for the Rebels and Morbids on the condition was that the clubs were merged and that Michael Ljunggren and his friend Lasse Karlsson were not members. The Morbids – a club with only six members – rejected the invitation and, requiring support in its feud with the Hells Angels, instead began an affiliation with the Undertakers MC in
Zealand, who had contacts with the first
Bandidos chapter in Europe, located in
Marseille. The Undertakers were patched over by the Bandidos in December 1993, and the Morbids followed suit in January 1995 after first serving as a probationary chapter for a year. Ljunggren became the Bandidos Sweden national president. Upon its foundation, the Bandidos chapter in Helsingborg was attacked by the Hells Angels, beginning the
Nordic Biker War. ==Murder==