Either get scabbers, or take advantage of increased automation, or a combination of the two. The only way to prevent those scabbers is with outright illegal militant action focused on targeting them, which would earn you the ire of the state, and which most people also don’t want to engage in due to moral qualms.

You can prevent a couple trucks from leaving an amazon warehouse for a couple days when you can organize a general strike where you’re paying everyone a full stipend after saving maybe years of union dues, and that’s the legal way to protest, which costs like, tens or maybe hundreds of thousands of dollars in expenditure every day, and is basically a war of wealth attrition with a huge megacorporation.

You could do that, or you could get like one or two guys to slash tires, and then set those trucks back for about the same amount of time. Or slash the tires of the individual scabber’s home cars, which is maybe gonna be easier to pull off. How much of that militant action can you engage in, as an organization, though, before the feds just decide to completely crack down on you and deem you to be domestic terrorists, along the lines of what happened to the people engaged in the “stop cop city” movement? That’s a good example of what’s even a relatively low scale and low stakes operation, that’s not very militant, and they’re still getting slapped with rico charges and domestic terrorism.