The OWS movement emerged after a group of demonstrators gathered in New York's financial district on September 17, 2011 to protest, among other things, the excessive influence of big corporations on the US policies as well as the unjust distribution of wealth and the high-level corruption in the country.
The movement was followed by rallies, in which the protesters started using the slogan, "We are the 99 percent" to distinguish themselves from the one percent of Americans, who are in possession of the greatest portion of the nation's wealth.
The OWS movement's anniversary comes six weeks before November's crucial presidential standoff between the incumbent President Barack Obama and his Republican challenger, Mitt Romney.
Police in New York City have arrested at least 180 Occupy Wall Street (OWS) protesters marking the first anniversary of the grass-roots anti-capitalist movement.
Dozens of people were taken into custody on Monday at one entrance to Wall Street.
Several protesters were also detained at another entry point to the New York Stock Exchange.
Others were arrested when they started moving from Zuccotti Park, the site of the OWS movement's birth, toward Wall Street as security forces blocked side streets.
"We are sending the message that Wall Street bankers cannot go to work every morning without thinking what their institutions are doing to the country," Mark Bray, a spokesman for Occupy Wall Street movement, said.