I'm anti-union AND pro labour regulation. Your government should be targeting wealth inequality with legislation and public services on all of these issues. The union tends to become another opaque organisation with a power hierarchy of its own and layers of internal politics and power struggles. The unions rarely if ever push for legislation change either because it would risk their existence.
The corporations should live in fear of the government, not an independent union.
Also my father was a union member for many years but was ousted after suggesting that full time management were wasting members' money on expenses. This turned into a 2 year long shit show where he was pretty much forced out of the job he had for being a non union scab. As much as being told he was a lesser human.