It's no secret some self-designated terrorist groups are in fact transnational organized crime networks. Take a look at the following list:

- FARC ( Colombia )
- AUC ( Colombia )
- Real IRA ( Ireland )
- LTTE ( Sri Lanka - Tamils )
- Shining Path ( Peru - Quechua Amerindians )
- ETA ( Spain - Basque )
- PKK ( Turkey - Kurds )
- Islamic Jihad ( Middle East - Palestinians )
- AQIM ( Algeria - Kabyle Berbers )
- Hezbollah ( Lebanon - Lebanese Shiites )
- Grey Wolves ( Turkey - Turks )
- Abu Sayyaf ( Philippines - Moro Filipinos )
- UWSA ( Myanmar - Va people )
- Iranian Revolutionary Guards ( Iran - Persians )
- Taliban ( Afghanistan - Pashtuns )

At least 15 terrorist groups that can be described as major forces in transnational organized crime. Members of the ethnic groups of those organizations are often known for setting up gangster networks in countries abroad. Almost all of them can be found to be involved in organized criminal activities in North and South American and Europe. Va people are a major force in the underworld of Thailand.
In my opinion it certainly occurs that members of these groups abandon terrorism for organized crime.