Four more nabbed in alleged ATO tax fraud

Another four men from Sydney have been embroiled in Australia's largest alleged white-collar crime, which brought down a senior public official more than a year ago.

The men - aged 37, 48, 55 and 60 - were issued court attendance notices this week by the Australian Federal Police.

Ten people are already before the courts for their alleged involvement in stealing an estimated $130 million from the tax office, following an investigation by Operation Elbrus that kicked off in September 2016.

Eight months later, in May 2017, more than 290 AFP officers took part in raids on 28 homes and businesses.

Those caught up in the alleged scheme - which involved a syndicate of companies, straw directors and bank accounts - include Adam and Laura Cranston, the adult children of former Australian Taxation Office deputy commissioner Michael Cranston.

Their alleged involvement led to the then-deputy commissioner's suspension and later resignation.

While it's not suggested Mr Cranston had knowledge of or involvement in the syndicate, he has been accused of unwittingly assisting it by providing information to his son.

Assets already seized by the AFP include two planes, sports cars, jewellery, artwork, firearms and at least $1 million cash found in a safety deposit box, 18 residential properties, 12 motorbikes and vintage wines.

The four men are due to face Sydney's Downing Centre Local Court on July 31, the AFP said on Friday.

They face a variety of charges including blackmail, fraud and dealing in the proceeds of crime worth $100,000 or more.