Construction identity George Alex has been found guilty of conspiring to defraud the tax office of more than $10 million through his labour-hire firms as his marathon six-month trial came to an end on Tuesday.

After more than a month of deliberations, the jury returned a guilty verdict for the 53-year-old over the fraud charges, as well as his accused co-conspirators Lindsay Kirschberg, Gordon McAndrew and Peter Loccisano.