At Tufts University, there is a web page that addresses this phenomena, the Hoarding of Animals Research Consortium. If you've never walked into a property of a hoarder, you might be shocked. I went to a former breed rescue, walking in after most of the dogs had been confiscated and what I noticed first was the smell. Not only did the kennels smell, but the office with the urine-soaked carpet, shiny with not quite cleaned off feces. There were open pits that smelled of urine in the kennels. One held a dead rat. Since then, HARC has photos similar to these on its website.
I have known of three other local non-profit animal rescue operations that had gone bad. HARC calls these the "rescue or shelter" type of hoarder.
I'm not counting the one with the four hundred, located in Lancaster nor the one with St. Bernards or the one with the tigers. It was easy to shrug off the infamous cat ladies, but this is a mental illness, compassion gone wrong. The financial cost to the community is enormous and the suffering of animals is impossible to measure.
Four hundred animals require a lot of love and require a lot of hard cash. If you have something to spare, help insure that the second time around, these animals will really be saved.