What part of speech

The correlatives are therefore wrongly placed in The tourist industry was affected both by the growing crime rate and the recurring epidemics; correct to both by the growing crime rate and by the recurring epidemics or to by both the growing crime rate and the recurring epidemics.

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I understand the descriptions. (misplaced correlatives-> correct to -> correctly placed ones) Nevertheless, I failed to understand the phrase "correct to" clearly, it alone being left unsettled. What part of speech is "correct to"? (correct is a verb and to is a preposition? or correct is an adjective and to is a preposition?)