MOSCOW — When police break up your meeting because of a false bomb threat, that could be just bad luck. When someone glues your office door shut, that could be just a misunderstanding about the rent. And when a stranger comes up to you in the street and dumps green guck all over your face, that could be just a random act of hooliganism.

When this kind of thing happens to you every day, that means you’re Alexei Navalny, Russia’s most prominent anti-corruption crusader and a declared candidate for next year’s presidential election – the mother of all uphill battles, given that your likely opponent is Vladimir Putin.

And if you’re Alexei Navalny, there’s a good chance you’re going to wake up Monday in jail.

Authorities have preemptively banned a rally Navalny has organized for central Moscow on Sunday, as well as others planned across Russia.

The demonstrations were called to protest what he claims is rampant corruption in the Kremlin. Putin’s spokesman has said that even urging people to take part is illegal.

And Alexander Gorovoi, a senior Russian police official, warned Friday that authorities will “bear no responsibility for any possible negative consequences” for people who do show up.

That could mean that if something is started by pro-government activists who routinely interfere with Navalny’s campaign stops, officers might stand aside and let it happen.

Navalny, who has been arrested several times over the years, said the rally will go on.

“The Kremlin sees us as their enemy, but what should I do?” he said Thursday in his Moscow headquarters. “I’m not going away. I live here. I’m going to live here.”

What Navalny has done to provoke official enmity is issue frequent statements alleging instances of top Kremlin officials amassing huge fortunes. Most recently, he released a report and a 50-minute video detailing allegations that Prime Minister Dmitry Medvedev has funneled more than $1 billion in bribes through companies and charities run by his associates to acquire vineyards, luxury yachts and opulent mansions.

The Russian government has barely acknowledged those accusations. One lawmaker in the State Duma, a communist, asked for an inquiry into Navalny’s report. Otherwise, the only palpable reaction has been that when the activist appears in public, eggs are tossed in his face, activists from the pro-government National Liberation Movement shout down his speeches, and occasionally he is doused with a green, Soviet-era topical antiseptic known as zelyonka.

But that is shaping up to change Sunday when Navalny and his supporters plan to challenge the bans on their rallies in Moscow and across the country.

In an interview Thursday, during a rare stop in Moscow, Navalny argued that staging the protests is worthwhile, despite the likelihood that he will be arrested, because it will signal the breadth of the support for his message – that Russia needs to rid itself of what he sees as a kleptocratic and authoritarian regime. People in 100 Russian cities have indicated they will turn out Sunday, he said, and more than 10 million people have watched the YouTube video about Medvedev.