Which law significantly increases prison sentences for repeat offenders?

The Three Strikes Law is significant because it mandates harsher sentences for individuals who are convicted of multiple felony offenses. Under this law, once a person has been convicted of three serious crimes, typically violent felonies, they may face life sentences or significantly increased prison terms for subsequent offenses. This approach is intended to deter repeat offenders by imposing severe legal repercussions and reflects a belief in the necessity of strict measures to ensure public safety. The law's emphasis on recidivism underscores a societal response to crime that prioritizes punitive measures over rehabilitation.

In contrast, common law refers to legal precedents established through court decisions rather than statutes, and while minimum mandatory sentencing and federal sentencing guidelines do influence prison sentences, they do not specifically focus on the recidivism aspect as the Three Strikes Law does. Thus, the Three Strikes Law distinctly stands out as the correct answer here, as it specifically targets those who repeatedly commit serious offenses.