Thousands rallied at Grand Park in support of union leader David Huerta in June after he was detained by federal immigration agents. But the Labor Day celebrations will be tempered by a sobering reality: Unions face mounting pressure to protect their members from the Trump administration’s immigration raids, cuts in Medicaid services and a weakened National Labor Relations Board. AdvertisementIn early August, the Trump administration moved forward with a plan to end collective bargaining with federal unions across a swath of government agencies. The changes portend tough times ahead for California unions. “The labor movement is fighting for its survival over the next four years.”Challenges are especially acute in the healthcare industry.