UPDATE 1-Berlusconi says communist judges out to destroy him

* Berlusconi trial restarts Nov. 16

* Latest outburst a foretaste of how he may defend himself

* Opposition MP calls for resignation; demo planned Dec. 5

(Adds reaction from magistrate, calls for resignation)

By Philip Pullella

ROME, Oct 28 (Reuters) - Italian Prime Minister Silvio Berlusconi gave a foretaste of how he may defend himself when he goes back on trial for corruption next month, attacking the judicial system as overrun by "communists" out to destroy him.

"The real Italian anomaly is not Silvio Berlusconi but communist prosecutors and communist judges in Milan who have attacked him again and again since he entered politics and decided to attack the power of the communists," an angry Berlusconi said on television on Tuesday night.

The comment in a telephone call to the show from his home, was his first public reaction to a ruling by a Milan court hours earlier which upheld a conviction against British lawyer David Mills for accepting a bribe from Berlusconi in 1997.

Mills is appealing that verdict, which one of Berlusconi's lawyers called "diabolical", in Italy's highest court. Berlusconi will be tried separately for his role in that case.

"Is Silvio Berlusconi really the most criminal businessman in the history of the world," said Berlusconi, who has long accused Italy's magistrature of being politically biased.

Antonio Di Pietro, a former anti-graft magistrate and now an opposition parliamentarian, called on Berlusconi to resign over the Mills verdict and said a national demonstration to demand he step down will be held on Dec. 5.

Magistrate Alfredo Robledo rejected Berlusconi's use of the term "red robes" to describe judges he says are communists. "If our robes are red, it is because of the blood some have spilled to defend the law," he said, referring to the killings of magistrates by Red Brigades militants in the 1970s and 1980s.

Berlusconi has been in combative mode since Italy's top court this month ruled that his protection from prosecution while he holds office violated the constitution. That ruling overturned a law passed by his government which critics denounced as tailor-made to protect him from his legal woes.

RETURNS TO THE DOCK NEXT MONTH

A number of corruption trials against the 73-year-old prime minister that had been suspended by the law will now either resume where they left off or start again.