Manhattan's parks were filled with May Day demonstrators on Monday.

Rallies in support of immigrant workers were being held in Union Square Park, Washington Square Park and Foley Square throughout the day.

The Foley Square demonstration featured a slew of speakers, including Mayor Bill de Blasio, City Council Speaker Melissa Mark-Viverito, Public Advocate Letitia James and city Comptroller Scott Stringer.

Scroll through to see photos from the demonstrations.

May Day protesters gather in Foley Square in
May Day protesters gather in Foley Square in Manhattan on Monday, May 1, 2017. (Credit: Corey Sipkin)
Mayor Bill de Blasio with a man at
Mayor Bill de Blasio with a man at the May Day rally in Foley Square in Manhattan on Monday, May 1, 2017. (Credit: Corey Sipkin)
City Council Speaker Melissa Mark-Viverito speaks to the
City Council Speaker Melissa Mark-Viverito speaks to the crowd in Foley Square in Manhattan during a May Day rally on Monday, May 1, 2017. (Credit: Corey Sipkin)

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May Day demonstrators gather at Manhattan's Foley Square
May Day demonstrators gather at Manhattan's Foley Square on Monday, May 1, 2017. (Credit: Corey Sipkin)
Alex Evis, with his 6-year-old daughter Bronwen Evis,
Alex Evis, with his 6-year-old daughter Bronwen Evis, take part in the May Day rally in Foley Square in Manhattan on Monday, May 1, 2017. (Credit: Corey Sipkin)
Demonstrators gather in Foley Square in Manhattan for
Demonstrators gather in Foley Square in Manhattan for a May Day event on Monday, May 1, 2017. (Credit: Corey Sipkin)
People gather in Union Square Park for May
People gather in Union Square Park for May Day demonstrations on Monday, May 1, 2017. May Day, also called International Workers' Day, dates to 1886 when about 300,000 workers across the country walked off their jobs to demand better working conditions. (Credit: Charles Eckert)
May Day demonstrators in Manhattan's Foley Square on
May Day demonstrators in Manhattan's Foley Square on Monday, May 1, 2017. (Credit: Corey Sipkin)

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People gather in Union Square Park for May
People gather in Union Square Park for May Day demonstrations on Monday, May 1, 2017. May Day, also called International Workers' Day, dates to 1886 when about 300,000 workers across the country walked off their jobs to demand better working conditions. (Credit: Charles Eckert)
Angelica Martes, 67, attends a May Day rally
Angelica Martes, 67, attends a May Day rally in Foley Square in Manhattan on May 1, 2017. (Credit: Corey Sipkin)
May Day demonstrators rally in Union Square on
May Day demonstrators rally in Union Square on May 1, 2017. (Credit: Getty Images / Drew Angerer)
People gather in Union Square Park to support
People gather in Union Square Park to support a May Day rally in Manhattan on May 1, 2017. May Day, or International Workers' Day, is observed all over the world on May 1 to celebrate the economic and social achievements of workers and the fight for labor rights. (Credit: EPA / Peter Foley)
People gather in Union Square Park for May
People gather in Union Square Park for May Day demonstrations on Monday, May 1, 2017. May Day, also called International Workers' Day, dates to 1886 when about 300,000 workers across the country walked off their jobs to demand better working conditions. (Credit: Charles Eckert)

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People gather in Union Square Park for May
People gather in Union Square Park for May Day demonstrations on Monday, May 1, 2017. May Day, also called International Workers' Day, dates to 1886 when about 300,000 workers across the country walked off their jobs to demand better working conditions. (Credit: Charles Eckert)
Manhattanites Susan Cole, 73, and Denise Martin, 76,
Manhattanites Susan Cole, 73, and Denise Martin, 76, attend a May Day rally in Foley Square on May 1, 2017. (Credit: Corey Sipkin)
May Day protesters in Manhattan's Foley Square on
May Day protesters in Manhattan's Foley Square on Monday, May 1, 2017. (Credit: Corey Sipkin)
May Day demonstrators gather in Manhattan's Union Square
May Day demonstrators gather in Manhattan's Union Square Park on Monday, May 1, 2017. (Credit: Charles Eckert)
Counter-protestors, who identified themselves as
Counter-protestors, who identified themselves as "anti-communist and anti-socialist" and supporters of President Donald Trump, gesture and shout across the street toward May Day demonstrators in Union Square on May 1, 2017. (Credit: Getty Images / Drew Angerer)
A protester is arrested as he marches with
A protester is arrested as he marches with others from Manhattan's Union Square Park during a May Day rally on May 1, 2017. (Credit: Getty Images / Spencer Platt)
A protester is arrested as a group tries
A protester is arrested as a group tries to march from a May Day rally in Manhattan's Union Square Park on May 1, 2017. (Credit: Getty Images / Spencer Platt)
May Day demonstrators scuffle with counter-protesters, who defined
May Day demonstrators scuffle with counter-protesters, who defined themselves as "anti-communist and anti-socialist" and supporters of President Donald Trump, during a May Day rally in Manhattan's Union Square Park on Monday, May 1, 2017. (Credit: Getty Images / Drew Angerer)
Counter-protesters, who described themselves as
Counter-protesters, who described themselves as "anti-communist and anti-socialist," and supporters of President Donald Trump scuffle with May Day demonstrators in Manhattan's Union Square Park on Monday, May 1, 2017. (Credit: Getty Images / Drew Angerer)
A supporter of President Donald Trump joins a
A supporter of President Donald Trump joins a May Day rally in Union Square Park on May 1, 2017. (Credit: Charles Eckert)
President Trump supporters shout at adversaries gathered in
President Trump supporters shout at adversaries gathered in Union Square Park for May Day demonstrations on May 1, 2017. (Credit: Charles Eckert)
People gather in Union Square Park for May
People gather in Union Square Park for May Day demonstrations on May 1, 2017. (Credit: Charles Eckert)
Demonstrators scuffle with a counter-protester, whom they accused
Demonstrators scuffle with a counter-protester, whom they accused of making racist comments, during a May Day rally in Union Square Park on Monday, May 1, 2017. (Credit: Getty Images / Drew Angerer)
A man holds a sign during a May
A man holds a sign during a May Day demonstration in Washington Square Park on Monday, May 1, 2017. (Credit: Charles Eckert)