100 acres is insufficient land to feed, clothe, and house 100 people.
Ten times that much might get them subsistence living. 50 times and now you are talking.
People eat a LOT...so do livestock. And you are going to want a variety of livestock from chickens, pork, beef, and fish. (Milk, cheeses, and eggs) Then there's the wheat for bread, oats for oatmeal, and corn. Nevermind rice and soybeans.
Apiaries for honeybees. Trees for fruits and nuts.
Now all these groceries require fertilizers and pesticides. Otherwise you flat out will not get a crop. The bugs and birds will consume it all.
So since the livestock will produce manure...you can use that...but it still won't be a sufficient amount. You will need more. That means $$$. Meaning you need more land to farm to make enough of a profit just to buy diesel and farm equipment that will need maintenance every year. (More $$$)
1,000 acre farm of two crops usually works out for six people on a regular basis...no one gets rich but you can make a living. That's what happens today. Those are the numbers.
So I don't see a farm commune working out. They already exist in rural areas today but not as a commune...but as regular God fearing people living in harmony. Strangers are given the one squinted eye routine. And their biggest fights are usually over John Deer or the other brands.