Stalin had kulaks listed as "class enemies". Kulaks was supposed to be the richest 20% of farmers, but it was a loose category that anyone could fall into (like a "racist" today). Sell a bushel of grain while someone's watching? Kulak. Continue attending church after they've tried to shut it down? Kulak. Hire any laborers because you can't work it all yourself? Kulak. They wanted landless and interchangeable peasants on state owned farms.