Here it is from the horse's mouth, the newspaper of the ILA - International Longshoreman's Union:

https://ilaunion.org/2021/05/latest-long-beach-terminal-auto...

"TTI would become the fourth automated container terminal in Southern California. Total Terminals International’s (TTI’s) decision this week to automate its 385-acre Pier T terminal in Long Beach sets up a classic struggle between terminal operator employers and the International Longshore and Warehouse Union (ILWU).

"The union opposes the project on the grounds it will eliminate some dockworker jobs, but employers say automation is needed to increase capacity and keep the ports of Long Beach and Los Angeles competitive."
[...]
ILWU Local 10 in 2019 tried unsuccessfully to convince the city of Los Angeles to block a construction project for the APM Terminals automation project.

Here is the AP:

https://apnews.com/article/49e7d246e6984738b107a9ae0e25f954

The uproar comes as a facility operated for Denmark’s Moller-Maersk by APM Terminals plans to use the battery-powered, self-guided cargo handling equipment, which APM contends is a response to the ports’ clean air rules.
[...]
Union members, however, fear the equipment will spread to all terminals and hundreds of jobs will be lost. They contend APM could use manned electric vehicles.

Las Vegas Culinary union strike:

https://www.huffpost.com/entry/american-workers-jobs-inequal...

https://eandt.theiet.org/content/articles/2018/05/50-000-las...

Over 50,000 union workers in Las Vegas, Nevada, USA, are set to go on strike if new contracts are not settled. One of the main drivers for the strike action is the fear that robots will gradually displace human operators.

The Culinary Union is just one of many labor unions grappling with how to respond to the spread of automation and artificial intelligence – whether driverless trucks or lifting and sorting machines at warehouses. Alongside the fears automation poses to workers, there are concerns that it is also undermining the very organizations designed to support them: labor unions.

Harry Katz, former dean of the Cornell University School of Industrial and Labor Relations, said automation has reduced unions’ might in many industries by shrinking their membership and making it easier for companies to break or survive a strike. Organized labor is likely to lose further power and membership as a result of the ongoing wave of automation, he said.

* Boeing machinists' union:

https://finance.yahoo.com/news/boeing-machinists-union-tussl...

Union leaders are concerned about a Boeing campaign known as “Quality Transformation,” which relies on automated processes such as robotic riveting and precision machining to cut down on manufacturing defects. Boeing says such processes make airplane assembly more “mistake-proof.”

Aero Mechanic said Boeing laid out its plans and their potential effect on quality-assurance jobs in November.

“Per the PowerPoint Boeing presented to our union, Boeing estimates their plan will impact 451 QA jobs next year and potentially a similar amount in 2020,” the newspaper reported. “This will not only place a heavier burden on our mechanics but will also eliminate the second set of eyes on thousands of work packages.”

* 1953-55 UAW strikes at Ford over automation

see this historical case study:

http://www.autolife.umd.umich.edu/Labor/L_Casestudy/L_casest...

Rising to speak in support of the automation resolution, Alfred Granakis, Local 1250’s convention delegate, stated, “I just want to say a couple of words on this because we have got 78 people in Cleveland doing the work of 770 people from the Rouge and we are out-producing them with 78 people. . . . I am representing more machines than I am men in Cleveland. The thing I would like to see is this changed just a little bit.” He then chided UAW President Reuther: “I wish the Executive Board would be instructed to formulate a policy and inform the local union affected by it.” Reuther responded, “We are completely aware and fully conscious of the problem which the resolution covers. . . . The Ford engine plant is the best example today where they have whole batteries of machines with a fellow on one end and another fellow half a block away with the whole thing mechanized.”

After the UAW convention Granakis again urgently wrote Reuther, “As you are well aware, the problem of production standards is one of a recurring nature and needs eternal vigilance, particularly with the reactionary Ford Motor Company.” In UAW Local 1250’s contract negotiations, automation continued to prove the most intractable issue. “As for the problem of Automation,” Granakis told the UAW President, “except for saying ‘no’ and insisting on more men on the job, I have taken no other position until I hear from you.” In order to capture the Ford negotiators’ attention, and possibly Reuther’s too, Local 1250 leaders sought and received formal approval for a strike authorization request from the Cleveland area UAW regional director.

In addition to high rates of absenteeism and numerous shop-floor grievances, [..] an overwhelming majority (almost 90 percent) of the engine-plant workers voted to authorize a strike in the midst of collective bargaining over automation problems. In 1953 the Ford Cleveland engine plant and foundry had four unauthorized work stoppages; in 1954 there were two unauthorized walkouts. These wildcat strikes idled 1,970 men and resulted in 8,439 lost man-hours. These walkouts comprised the tip of the iceberg of worker discontent over automation.