What's driving investigations into politicians in Latin America?

Impeached by the same parliament he tried to dismiss, Pedro Castillo is behind bars facing rebellion charges as criminal investigations continue. Days earlier, Argentina's vice president, Cristina Kirchner was convicted of corruption.
The former president's immunity keeps her out of jail, but unless she wins any appeal, her political career will be over.
All this, just weeks after Brazil elected Lula De Silva president for a second term - a dramatic reversal after 18 months in jail for corruption, before his conviction was annulled.
So, why have several current Leftist leaders in Latin America been under investigation?

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