Quarantine staff at Australia's international airports walked off the job for four hours on August 19.
The action was part of a campaign by Community and Public Sector Union (CPSU) members working in the Department of Agriculture, Forestry and Fisheries (DAFF) to win a better enterprise agreement.
The strike caused some delays at the airports, and affected cargo inspections, the release of imported goods and the x-ray screening of international mail.