I'm a criminal! Cause every time I write a rhyme
These people think it's a crime to tell 'em what's on my mind

from Eminem – Criminal Lyrics on Rap Genius

Meaning

Some people equate controversial and violent lyrics with actual crimes like rape and murder — it is these type of people that Eminem is calling out on this record. In his opinion it is ridiculous for people to treat him like a criminal for exercising his right to freedom of speech.

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