Historically this isn’t the case. Current polling does have Poilievre as the most popular choice among union members, however still at a lower rate than the Canadian average. So it seems like unions are stemming the growth of his support among its members somewhat, within the context of an overall upswell of Con support in Canada generally.
I think it’s important to make a distinction between union members and blue collar union members. I’m sure teachers and public servants are more likely to lean further left but all the rhetoric I’ve heard on construction sites since I got into a trade has been super conservative.
The union even endorsed Doug Ford in the latest provincial election.
For the record I have polar opposite political views to the other workers and it’s a very lonely world