Long prison sentences were imposed yesterday on Carmine Persico,
his son and six others convicted in June as leaders of the
Colombo family of the Mafia.  Mr. Persico, identified as the
crime family's boss, received a 39-year sentence. He was also
awaiting the jury's verdict in a related racketeering trial
focusing on a ruling Mafia commission. Both cases were in
Federal District Court in Manhattan.  The jury in the commission
trial completed its fourth day without a verdict and will resume
deliberations today.  In sentencing Mr. Persico, Judge John F.
Keenan stared at him and said, ''You are a tragedy.''  ''You are
one of the most intelligent people I have seen in my life,'' the
judge told him, adding that Mr. Persico ''did a very good job''
acting as his own lawyer in the commission trial. Persico Pleads
for Son  Mr. Persico expressed concern for his 33-year-old son,
Alphonse, who was about to be sentenced. He contended that his
son was innocent and that the chief witness against him was ''an
out and out lia