Former Kiwis prop John Lomax has been arrested and charged with blackmail.
Lomax is due to appear in court in Canberra on August 5 on one count of blackmail, reportedly in relation to a Royal Commission into union corruption.
The 49-year-old is a member of the Construction, Forestry, Mining and Energy Union and the Canberra Times reported he was due to appear as a witness for the royal commission next week.
He is the third person arrested and second associated with the ACT CFMEU branch to be taken into custody.
Lomax played 15 tests for the Kiwis between 1993 and 1998 and played for the Canberra Raiders in their heyday in the early 1990s.