Looking for the Source: Gracchus in re publica restituenda..

Dear forum,

I’ve been looking for the source of a sentence I found in an introductory Latin grammar. As there is no mention to the author or the work, it may or may not be of genuine Latin authorship. :blush: The sentence I am trying to locate is the following:
Gracchus in re publica restituenda occidit.

I am looking forward to any tips to help me locate texts in the source.

Thank you in advance,
passim