No and it's about the only thing that would make the game better. There is no collective workers struggle that topples the Pigmasks, it revolved around 2 psychic kids, a dog and a neet finding enough mcguffins.
It is the most outwardly anti-capitalist game I've ever played though, and probably the best JRPG ever made in regards to the system it came out on. Like, they pretty accurately depicted the carrots and sticks of imperialism, they never try to portray capitalism as anything but "when things got shitty", reform isn't even on the table because any half measure would still be barbaric compared to what the Nowhere Islands were before.
Even the personal stories the characters go through have a strong anti-reactionary bent. The entire chapter with Flint shows just how hollow and useless petty revenge against an exploited group is, but it never hesitates to show that all violence carried out against the Pig Mask Army is absolutely fucking justified.
One of my biggest frustrations with other supposed anti-capitalist games is that they try to suggest that whatever self-defense against capitalism is taken is just as brutal as capitalism itself, The Outer Worlds being the first example that comes to my head. The only time Mother 3 comes anywhere close towards that would be the ending, and even then between the way the events play out and the story that led up to it, totally justified.
Also the Pig Masks are the perfect fascists. They show up as police a lot of the time, and do "police shit" (protect capital). They're threatening with their tech and fetish for violence, but they're also a bunch of fat dipshits who bumble around in an amusing way.