Videos showed festive scenes of protesters, both young and old, waving signs in support of the arrested governor and chanting “Freedom for Furgal,” “Moscow Get Out” and “Putin Step Down.”
Protests were also reported in Komsomolsk-on-Amur, an important industrial center, Solnechny and other towns in Khabarovsk Krai.
A former timber and scrap metal trader, Mr. Furgal has long been trailed by accusations of criminality.
But protesters said they were less concerned about his innocence or guilt and more concerned that his alleged crimes, ignored for nearly two decades by investigators, had suddenly been used to depose a governor who, unlike Mr. Putin, had won a real and competitive election.
Appearing in court in Moscow on Friday, Mr. Furgal pleaded not guilty to charges of multiple murders and attempted murder in the early 2000s. His arrest now, so many years later, was widely seen as politically motivated, the latest heavy-handed strike in a rolling crackdown unleashed after a rigged national plebiscite on constitutional amendments effectively entrenched Mr. Putin as president for life.
After seven days of voting, the electoral commission in Moscow last week announced that Mr. Putin had won what the Kremlin described as a “triumphant referendum on confidence.” More than 78 percent of voters endorsed amendments that allow Mr. Putin to crash through term limits previously mandated by the Constitution and stay in power until at least 2036. He was supposed to step down at the end of his current term in 2024.