The enrichment of government officials and those close to them has been the No. 1 issue of Navalny's Anti-Corruption Foundation and his new YouTube channel, which bypasses state media to get out his message.
OVD-Info said more than 700 people were taken into custody in Moscow and more than 500 detained in St Petersburg, while state media put the number detained in Moscow at 200. Protesters younger than 17 years old have only known Russian leadership in #Vladimir Putin.
Yet, Navalny has insisted he is going to overturn the decision and still run for President of Russian Federation in 2018, unless the authorities use other methods to prevent him from doing so.
Why was Alexey Navalny arrested?
Anti-corruption rallies nonetheless took place all over Russian Federation leading to hundreds of arrests of demonstrators and clashes with riot police. "People were scared when we heard he was moving it to the center, but it turned out to be even better", said 20-year-old student Alexander, who was busy capturing the arrests around him on his iPhone. White House Press Secretary, Sean Spicer, said that the United States condemned Russian Federation for arresting peaceful protesters.
As Vorivoda spoke, demonstrators chanted, "Putin is a thief!" and "Power to the millions, not the millionaires!" Some of the demonstrations had received permission to go ahead, but in Moscow, police had warned they would be illegal.
Teenagers were seen crafting signs in the streets, the AP reported.
Today's protest coincided with the annual official June 12 holiday, Russia Day, for which Moscow authorities had organized a festival of re-enactments of different historical periods.
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Navalny, blue shirt, is detained by police outside his apartment in Moscow on Monday.
Despite the mass arrests in the March protests, the large turnouts on Monday prove that Navalny's campaign has managed to maintain momentum.
For that reason, he said he was unilaterally switching the venue to Tverskaya Street, Moscow's main avenue near the Kremlin. Russian police said Navalny was arrested for "failing to follow police orders and violating public order", according to the Guardian.
The marches marked an unusual day of significant public dissent in Russian Federation and one that brought rare political disruption to the heart of Moscow, as demonstrators defied police and marched down the city's main street.
Mr Navalny, a former lawyer who was partly blinded after having a green liquid thrown in his face in April, has previously been jailed for his role in leading protests. She was later detained in the latest protests, and her status is unknown.
Electricity in his office was cut at around the same time as he was detained, briefly bringing down a live feed of nationwide protests, Navalny's spokeswoman said.
More than 1,000 protesters were arrested at a similar rally March 26. Police later said about 4,500 protesters had participated.
Although city authorities had agreed to a location for the Moscow protest, Navalny called for it to be moved to Tverskaya Street, one of Moscow's main thoroughfares. There was no immediate statement from police.
"Alexei has been detained in the stairwell", his wife Yulia wrote on his Twitter account about 40 minutes before the anti-corruption rally called by the Kremlin critic was set to start in the city centre. Around 5,000 people reportedly rallied in Novosibirsk, a Siberian city that saw its biggest crowds since 1991, when residents called for the end of the Soviet Union.