Comment by johnvonneumann

Because it doesn't work like that, you can't deny the benefits, the way they work (in Aus, it will be similar elsewhere) is with EBA (Enterprise Bargaining Agreements). Basically, the union will go into talks with companies, agree on conditions and then they will be spread out as an effective handshake rule across the industry. The union act as mitigators between businesses and workers, which pretty much changes the entire industry. So you can't really opt out. Unless of course you go and work for companies who don't sign the EBA's, and having worked in Construction before, the majority of these companies have malicious reasons for not signing, and you wouldn't want to work for them. I've seen a handful of people try to not pay dues, and it's pretty much always because they just don't want to pay money, whilst still pulling the benefits.