Participants suffered only minor cuts and bruises, and all were released the same day. Mr. Alekseyev, who spent this year’s protest coordinating from an apartment — his father was recently found to have cancer, he said, and he could not risk being jailed as a repeat offender — said previous years were bloodier.

Few others in Russia have risked being as publicly outspoken — or just as out — as Mr. Alekseyev. He calls news conferences at fancy Moscow hotels, gives interviews to newspapers and has appeared on television with increasing regularity. He has, for better or for worse, become the face of a budding campaign for gay rights in Russia.

His efforts have attracted news media attention and forced politicians to discuss the issue. But it is a steep uphill battle; asked to weigh in, Vladimir V. Putin, Russia’s prime minister, said homosexuals deepen Russia’s demographic crisis. And Russia joined many African and Muslim-majority countries on Friday in voting against a United Nations resolution condemning discrimination against homosexuals that, nevertheless, passed.

Mr. Alekseyev, who founded the group Gay Russia in 2005, believes that there can be no advance in rights until gay people are allowed to protest publicly.

But in a country where the authorities view any sort of public protest with trepidation, his position has provoked hostility.

“This is a very dangerous thing,” said Aleksandr Khinshtein, a member of Parliament, and Mr. Alekseyev’s principal opponent on the recent debate show. “Homosexuality can never be allowed to be considered normal. It’s a question of survival.”

Even other gay-rights campaigners have criticized Moscow Pride, saying the rallies and the violence that typically accompanies them distort perceptions of the issue in Russia, where there is still significant confusion about what homosexuality is and what exactly gay people want.