Can a collection agency freeze your bank account if you get Social Security checks in the state of Minnesota?

No one can seize a bank account without due process. SSD benefits by Federal Law are 100% exempt from creditor attachment. You must inform the court and provide evidence that the account has only SSD benefits and not other funds. Even so, all states have a set of exemptions that also includes a specified amount in a bank account that cannot be seized. It is sometimes called a "wild card." Without knowing your state of residency, I cannot be more specific, sorry.