Can one start a class action lawsuit against the IRS for unlawful or unethical practices?

My issue is not what the IRS does but how the IRS does it. Corporate and private businesses as well as service providers are expected to follow a certain level of ethics, values or procedures. And, their practices are expected to be honest and above board, without lying, or intentionally providing false information or interpretation of laws or legal contracts. Why is the IRS NOT held to the same level of standard as any other U.S business?!!! I propose starting a class action lawsuit to impose a CODE OF ETHICS and standard business practices/procedures that the IRS MUST adhere to. The same as any doctor, lawyer, therapist, teacher, private or corporate business (for the most part). What are your thoughts?