was he involved in any ontroversies?
Yes, in a Railway scandal.
Alexander Cameron Rutherford
 John R. Boyle began to ask questions about the agreement between the government and the Alberta and Great Waterways Railway Company, and Cushing resigned from cabinet over his views of this same agreement.

The Alberta and Great Waterways Railway was one of several companies that had been granted charters and assistance by the legislature to build new railways in the province. 
who was alexander cameron rutherford? Canadian lawyer and politician where was he born? On a  dairy farm near Ormond, Canada West what was his connection with alberta? He was elected university's Chancellor in 1927.
wiki:11660013
Alexander Cameron Rutherford [SEP] Railway scandal
The Alberta and Great Waterways Railway was one of several companies that had been granted charters and assistance by the legislature to build new railways in the province. The government support that it received was more generous than that received by the more established railways, such as the Grand Trunk Pacific Railway and the Canadian Northern Railway. Boyle, Cushing, and Bennett alleged favouritism or ineptitude by Rutherford and his government, and they pointed to the sale of government-guaranteed bonds in support of the company as further evidence. Because of the high interest rate they paid, the bonds were sold at above par value, but the government received only par for them and left the company to pocket the difference.