He has been a Labor Party member of the Western Australian Legislative Assembly since the 2008 state election, representing Cannington.
Prior to entering Parliament, Johnston spent seven years as the state secretary of WA Labor and was a former senior official of the Shop, Distributive and Allied Employees Association, the union representing retail and warehouse workers.
[2] On 13 December 2018 Johnston gained the Energy portfolio and relinquished Electoral Affairs, Commerce and Asian Engagement.
These laws include a maximum penalty of between five and 20 years imprisonment for individuals, along with fines of up to $10 million for companies responsible for the death of a worker.
This article about an Australian Labor Party member of the Parliament of Western Australia is a stub.