NEW YORK (AP) — The massive port workers' strike that has crippled all the major dockyards on the Eastern seaboard of the U.S. is highlighting a fear held by many workers: Eventually, we will all be replaced by machines.

The International Longshoremen's Association, which represents the approximately 45,000 dock workers who walked off the job Tuesday, is testing whether it's possible to fight back.

The union is demanding, along with hefty pay raises, a total ban on the automation of grates, cranes and container-moving trucks in its ports. But it's unclear whether they'll be able to stave off a trend that has seeped into virtually every workspace.

The growth of automation and technological advances have created tension between workers and management since the Industrial Revolution, when machines first began to manufacture goods that had previously been made by hand. And with the growing use of artificial intelligence, the group of jobs workers perceive as threatened with disruption is ever-widening.

"You cannot bet against the march of technology," said Yossi Sheffi, director of the MIT Center for Transportation & Logistics. "You cannot ban automation, because it will creep up in other places."

History of pushback against automation

It's not the first time that port workers have resisted automation. In 1960, as ports on the West Coast introduced machinery to move cargo once moved by hand, the union representing longshoremen negotiated protections for workers, including assurances that the current workforce would not be laid off, according to the International Longshore & Warehouse Union.

Harry Bridges, who led the union at the time, negotiated pay increases and job security arrangements for some of the workers, said Adam Seth Litwin, associate professor of industrial and labor relations at Cornell University.

"He saw that this was going to become potentially a real problem if he didn't try to get ahead of it," Litwin said. "Essentially what he was saying was, 'I recognize the reality of what's happening here, and the way to best represent my members is to make sure that they are protected.'"

The downside was that as port machinery became more common, the size of the union eroded precipitously over the years.

The coal industry went through a similar reckoning as conveyor belts and other machines displaced laborers. Union leader John Lewis negotiated for job security and pay increases for existing workers, but the encroachment of machines led to fewer hires, and over time the workforce and union ranks shrunk.

"Amongst coal miners today, he isn't necessarily a big hero, but he knew what he was doing. And I think he also recognized that fighting automation rarely makes a whole lot of economic sense, particularly if you're talking about a market that's at all competitive," Litwin said.

Some dockyards outside the U.S are far more automated and efficient, especially ports in Dubai, Singapore and Rotterdam, Sheffi said.

How to protect workers

There are ways unions and employers can protect workers. Some unions have negotiated that employees must receive guaranteed employment protection if companies bring in technologies that could make their jobs obsolete. Others have bargained for employers to provide tuition reimbursement or retraining programs so workers can shift into other roles when machines come in.

"The trick is to make it over time, not to do it haphazardly," Sheffi said.

When health care giant Kaiser Permanente switched from paper to digital medical records a decade ago, dozens of unions bargained together to ensure workers wouldn't lose jobs or face wage reductions as a result of the technology deployment. Drivers who moved boxes of medical records to warehouses and librarians who retrieved paper files who were trained and reassigned to roles such as medical librarians or coders, Litwin said.

"They ultimately all got pay increases because they ended up being in jobs that ended up being more highly skilled," Litwin said.

AI is starting to disrupt white collar jobs

Workers such as cashiers or file clerks who perform routine tasks and have lower levels of education face the greatest risks of their jobs being automated, according to Dawn Locke, a director at the U.S. Government Accountability Office. But the growth of artificial intelligence is increasingly threatening cognitive jobs.

In the months after the launch of ChatGPT, a generative AI tool that can compose essays, write computer code and engage in conversations, job postings for writers, coders and artists plummeted.

"Now we see law firms putting AI to use and cutting the number of junior associates," Sheffi said. "But it's a problem. How do you become a senior associate arguing before the Supreme Court if you don't start as a junior associate?"

When companies embrace artificial intelligence, it doesn't always result in workers losing jobs. In some cases the productivity gains enabled by automation or AI make workplaces more profitable, enabling them to hire even more workers.

But unions aren't taking any chances. In September, video game performers reached an agreement after striking with 80 games that provided protections around exploitative uses of artificial intelligence.

Last year, Hollywood screenwriters concerned that scripts would soon be written by artificial intelligence won protections against the use of AI after a five-month strike.

"More and more people who thought they were immune from automation are probably looking to groups like the longshoremen and thinking, 'Wait a second, actually, I may not be that far removed from this,'" Litwin said.