In all seriousness, why does it matter to you what labor conditions are like in China?
Having foam pumped into your walls is by far the best sound proofing product you can get, it is also the best insulating r value wise and will stop any drafts you may haveThe best product of this type is made by the Upjohn companyIt is a resin base and requires renting equipment.The second best will be blown in cellulose But if you already have fiberglass in the walls the foam will be your best Solution.The cheapest way would be to file a complaint with your local police dept.
True StoryWhenever I was living in New Orleans I lived in Mid City, up EsplanadeWell DOWN Esplanade is a very historical neighborhood called the Faubourg Treme and the Faubourg Marigny, very hipsterLittle shitshacks for $1800/month (really cool interior) but you have to understand, these buildings are literally worth hundreds of thousands of dollars a pieceBrad Pitt owns property thereIt's in the 9 ANYWAYSWherever the home owners and the laborers were buying material from the local hardware stores like Lowe's and whatever, there was huge batches of CHINESE drywallGoogle that oneIt literally crumbles after a week and can make you sick as fckLiterally MILLIONS of dollars worth of damageIt was all over the Times PicayuneThey were fcking FURIOUSDoes China owe any money? NO
check out roxul safe and sound barrier and there is a sound barrier drywall available plus watch all plug outlets and switches on the common walls sound will travel through them