If it can be abstract I would snap away the acceptance of hierarchy as a method of social control, like historically speaking go back to the first people who decided that there should be a person in charge of all the things and have the people say "Naw, that's fucked" and then that just not happen. Not that the idea of hierarchy not be in existence at all, because I think it would be more effective to have people recognize that it's bullshit and intentionally build societies antithetical to hierarchy rather than to have society's that are ignorant of its potential harm.
If it had to be a tangible thing that I could physically dissolve.... Parasites? Would all parasites count or is that too broad? Cuz if we got rid of fleas and leeches and mosquitoes and ticks that would wipe out huge swaths of vectors of disease transmission. No black plague, no zika, no dengue fever. If we wanted to expand the definition of parasites even broader than the the bourgeoisie class might be included but I wouldn't want to get my hopes up. XD