The Crown says Hamilton was the legal adviser to three people who acquired the company with the intention of using investors' funds for their own benefit.
Two directors have admitted a number of charges, with one so far sentenced to three years.
Hamilton no longer holds a legal practising certificate and left the partnership of Waipukurau firm Davidson Armstrong and Campbell (DAC Legal) in 2011, after more than 20 years. The Belgrave receiver is pursuing the law firm for compensation. Auckland accounting firm Hayes Knight is also being pursued.
Hamilton served for six years as Central Hawke's Bay's first mayor and was Waipukurau Rotary Club president and Central Rugby and Sports Club chairman. He was made a Member of the New Zealand Order of Merit in the 1997 Queen's Birthday Honours.
In 2011, he faced bankruptcy over an unpaid brothel debt.