I assume you want me to say labour.
But Communism is meant to stand above the battle for supremacy between the proletariat and the bourgeoisie, which, taken alone, is the realm of chartism and trade unionism.
Taken dialectically, the mass unemployment of a strata of workers also causes massive repercussions for the stability of the capitalist system. Without workers earning wages, an integral part of the the circulation of capital, that of the reproduction of variable capital I.e. the consumption of goods and services by the proletariat is interrupted. This then causes shockwaves in the form of crises of overproduction that throw even more people into poverty, joblessness and disarray. This then produces opportunities for the proletariat to fight back against a weakened system that is no longer functioning to keep them fed and placid. The attack against labour invokes its opposite, an attack of labour against capital. It is at this point the communists put forth their argument - it is not enough to wring concessions from the ruling class that put you in this mess, you must seek to transform society by their overthrowal and by the collective and democratic ownership of the means of production.
I can assure you that while a strike is a powerful weapon against the bourgeoisie, an uprising and revolt is certainly a greater power that doesn't rest simply on labour downing tools and not showing up to work.
I understand the frustration against the way capital is wielding LLMs and similar technologies as a cudgel against tech and art workers in particular, but we have to think a level above the current clash between labour and capital. We have to think about the war not just the battle.