Her conviction in 2003 for electoral fraud caught the attention of authorities who took her into a room at the international airport and questioned her.
“I explained I was Australia’s first political prisoner,” she said of the conviction, which was later quashed on appeal.
Hanson said she was questioned in front of other passengers.
“I felt terribly embarrassed,” she said.
The former One Nation leader was visiting New Zealand on a hiking holiday.
Authorities allowed her to enter after questioning.