Möller was one of the founders of the biker club Dirty Dräggels in Malmö. This club became a hangaround chapter of Hells Angels in 1990, prospects in 1991 and Sweden's first regular Hells Angels club in 1993. Möller became the club's vice president and Hells Angels' spokesman in Sweden, and later president. In 2003, the president title was handed over to his successor.
Möller's extravagant lifestyle in South Africa, where he lived in a seaside property in Llandudno close to Cape Town became the source of scrutiny from Swedish and South African authorities. In December 2007, the Swedish tax authorities demanded a payment of SEK 4.1 million from Möller due to undeclared income, which according to him was untaxable gambling profits. In March 2009, Möller's sickness benefit pay, which he had claimed for 10 years due to an alleged back injury, was withdrawn by the Swedish Social Insurance Agency, with demands for repayment to possibly follow. As of early 2009, he has possibly moved back to Sweden from South Africa.
- Tagesson, Pelle (2008-10-03). "Thomas Möllers bidrag: 2 miljoner" (in Swedish). Aftonbladet. Retrieved 2009-03-22.
- Lindelöw, Per (2008-01-03). "Ex-presidenten krävs på miljoner" (in Swedish). Kvällsposten. Retrieved 2009-03-22.
- "Hells Angels leader loses sickness benefits". The Local. 2009-03-22. Retrieved 2009-03-22.
- Johansson, Lars (2009-01-15). "Gynning festar med Hells Angels ex-president" (in Swedish). Expressen. Retrieved 2009-03-22.