Dia menggunakan seluruh kekayaannya demi kepentingan rakyat jelata.

English Translation

He used all his wealth for the benefit of the poor.

“Jelata” doesn’t necessarily mean “poor people”.
According to IndoDic, “jelata” means “commoners” or “the public in general”. KBBI defines it as “not noble or wealthy people” or “ordinary”. SEAlang dictionary says “rakyat jelata” is “the masses”.