More than 2,500 demonstrations have taken place across the United States, to express opposition to the policies of US President Donald Trump.
Demonstrators are challenging his crackdown on immigration, education, security and the sending of National Guard troops into US cities as part of the "No Kings" demonstrations.
The event was supported by over 300 grassroots groups including trade unions.
Events were planned for 2,600 American towns and cities, spanning all 50 states. An estimated five million people took part in the last No Kings day rallies in June.
There was a notably large crowd in Chicago, where an ongoing anti-immigration clampdown by Federal agencies is raising tensions.
Boston also saw a large turnout to protest the President, as did Atlanta in Georgia.
In New York, police say over 100,000 people took part in a No Kings march from Times Square to lower Manhattan.
Protests also took place on the West coast.
By all accounts, the demonstrations were largely festive, many featuring inflatable characters and marchers dressed in red, white and blue.
Little, if any, lawlessness was reported.
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"There is nothing more American than saying, 'We don't have kings’ and exercising our right to peacefully protest," said Leah Greenberg, co-founder of Indivisible, an organisation that led planning of yesterday’s events.
Trump says he is 'not a king’
Mr Trump has said little about the protests. In an interview with Fox Business aired on Friday he said that "they’re referring to me as a king - I’m not a king".
While the Democratic Party has coped with internal divisions over the best way to oppose Mr Trump, party establishment figures such as Senate Minority Leader Chuck Schumer and US Representative Alexandria Ocasio-Cortez both voiced their support for the "No Kings" movement.
On Friday, House of Representatives Speaker Mike Johnson echoed a common refrain among his party, labelling the "No Kings" protests "the hate America rally".
Other Republicans have accused organisers of the rallies of stoking an atmosphere that might spur more political violence, especially in the wake of the September assassination of right-wing activist and Mr Trump ally Charlie Kirk.
Dana Fisher, a professor at American University in Washington and author of several books on American activism, predicted that yesterday could see the largest protest turnout in modern US history.
She expected that over three million people would take part based on registrations and participation in the June events.
Overall turnout for the 14 June "No Kings" rallies was estimated at four million to six million, according to a crowd-sourcing analysis published by data journalist G Elliott Morris.
Ms Fisher said the protests were "not going to change Trump’s policies. But it might embolden elected officials at all levels who are in opposition to Trump".
Additional reporting by Reuters
