Marshall O'Hara, 21, Fraser Stewart, 22, and Aiden McLaughlin, 21, targeted houses and a carpet firm linked to the Daniel crime family.
Andrew Quinn and James Quinn allegedly helped wage an eight-month campaign of violence and firebomb attacks across Scotland.
Officers are probing whether the deliberate blaze is connected to an ongoing feud between rival groups in Edinburgh.
Parents of children with cystic fibrosis are trying to get Kaftrio before it is taken off the NHS.
Pupils in North Lanarkshire are continuing to have problems with school buses a week into the new term.
Homes were targeted in Bathgate, Beith, Stranraer, Cambuslang, Paisley, Stepps, East Kilbride and Glasgow.
