SPQR were the initials used by the Romans for “Senatus Populusque Romanus”. Bossi is the leader of the Lega Nord a political party in government with Silvio Berlusconi but with the aim of creating a state called “Padania” in the north of Italy.
Italians, particularly the Romans, have been up in arms recently when Bossi, supposedly making a joke in Public, said that for the people of Lombardy the letters SPQR stood for “Sono Porci Questi Romani” i.e. “They are pigs these Romans”. The people of Rome did not see the joke.