The court of Additional District Judge (ADJ) Nand Kumar Shrivastava awarded life sentence to the four.
The court also imposed a penalty of Rs 30,000 on ex-MP Vijay Krishna and Rs 35,000 on his son Chanakya Singh.
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Krishna's servant Gagan and bodyguard Umesh Singh were awarded a penalty of Rs 6,000 each.
The same court had found the four guilty on Monday and reserved order for announcing quantum of punishment for today.
Krishna, his son and two others were present in the court when the verdict was announced.
JD(U) leader and transporter Satyendra Singh was killed in Patna in 2009 and his body thrown in the Ganga river locked in an iron box. It was fished out by the police later on.
Public Prosecutor Jaiprakash Singh pleaded death sentence for all the four in the heinous crime.
Krishna had defeated Chief Minister Nitish Kumar in the Lok Sabha election from erstwhile Barh constituency in 2004 polls.
At present, he is a General Secretary and national spokesman of RJD.