What is the legal way of evicting a boyfriend of 4 years in the state of Wisconsin?

Answer:
If he doesn't own the property, then kick him out! However, since you have dated him for 4 years, be the bigger person and be respectful to him.

Give him some notice.

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A crowbar to the knees?

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Say he hit you.

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If you have no written contract or lease just tell him to vacate and move on. If you do have a lease/contract with him then you need to legally evict him.

If you don't own the home then you can always move and not tell him where you're going.

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Don't let boyfriends move in with you. You can't evict someone because you're not dating anymore.

I hope you had the foresight to write a lease agreement, but if not he's there as long as he wants to be.

Your best bet is to cut off all non-essential utilities. There may be laws against cutting power and water, but does he like phone service? Cable TV? Internet? If so, you're not obligated to provide those things...cut the service. You may be able to "encourage" him to find another place of his own.