Secondary boycotts: The ghost of policies past

Apparently the current government is boycotting building companies with unacceptable labour practices.

http://www.smh.com.au/business/workplace-relations/clock-ticking-for-builders-to-avoid-black-list-20170208-gu8bp6.html

I wonder if this is different from a secondary boycott, both legally and in principle?

http://workplaceinfo.com.au/resources/employment-topics-a-z/secondary-boycott

Noting that the Liberal government appears to think that the use of secondary boycotts to further political aim is unfair

http://www.theaustralian.com.au/national-affairs/companies-to-get-protection-from-activists-boycotts/news-story/eb4805c2ea3b622d125e20d61ca75a7d?nk=cb62514c812ba9831627b7a4a864bb80-1486774384

I suppose it could be argued that a building company's employee union is not a third party to the relationship between the government and the building company, but in any case, it does seem to me to be a tactic that doesn't make sense unless the government is engaged in class warfare.

http://www.abc.net.au/news/2016-05-04/budget-2016-live-blog-reaction/7380888