A union formed on the basis of supporting one side of controversial global political issues with no direct connection to the wellbeing of the union workers seems like it would be on pretty questionable footing
This would be far from the first time it happened. Some notable examples:
- The 1984 refusal of US and Canadian dockworkers to unload South African cargo in protest of the apartheid government
- The 2019 The NYT Taxi Workers Alliance's work stoppage to protest a Muslin Ban
- The 2020 work stoppage from the ILWU in support of BLM
Union workers on the docks refused to load Pig Iron which was being sent to Japan, this was whilst Japan was committing atrocities in China.