Hundreds of ultra-Orthodox Jews crammed shoulder-to-shoulder inside a Brooklyn synagogue earlier this month, jumping up and down in unison and singing in Yiddish to celebrate a wedding. There was not a mask in sight in a video of the Nov. 8 event published by the New York Post.

Authorities say they only learned about the huge gathering at the Yetev Lev D’Satmar synagogue in Williamsburg after the videos began circulating on social media and a local Hasidic newspaper published a detailed account of how the synagogue’s leaders had plotted to keep it a secret.

Now, city leaders say they’re taking action. New York Mayor Bill de Blasio (D) said the event’s organizers will be fined $15,000 for violating pandemic restrictions, adding that more penalties could come.

“What we do know is unquestionably it was too many people,” De Blasio told reporters on Tuesday. “It appears that there was a very conscious effort to conceal what was going on. And that’s what makes it even more unacceptable.”

The wedding, organized by leaders of the Satmar sect, was the latest act of defiance against pandemic rules in Brooklyn’s Hasidic community, which health officials have cited for ignoring mask regulations and driving local spikes in the virus. Tensions boiled over in October, when hundreds of Orthodox Jews took to the streets to protest new restrictions on religious gatherings, clashing with the police and burning masks.

The conflicts come as coronavirus cases are on the rise in New York. The state reported 4,881 new cases and 45 new deaths on Tuesday, according to The Washington Post’s coronavirus tracker. In the past week, the percentage of new daily reported cases and deaths, as well as the percentage of covid-related hospitalizations have all risen in the state.

This was not the first time the Yetev Lev D’Satmar synagogue has come into conflict with officials over a wedding. In October, the state health commissioner personally intervened to shut down a planned wedding for the grandson of Zalman Leib Teitelbaum, the synagogue’s rabbi, that could have drawn 10,000 guests, the New York Times reported.

This month, for the wedding of the grandson of another rabbi, the sect’s leaders worked to keep the celebration a secret, according to Der Blatt, a Yiddish-language paper. The newspaper said it was aware of the wedding plans but remained quiet “so as not to attract an evil eye from the ravenous press and government officials,” reported the Times, which obtained a translated copy of the article.

But how did hundreds of attendees keep the secret?

“All notices about upcoming celebrations,” Der Blatt wrote, per the Times translation, “were passed along through word of mouth, with no notices in writing, no posters on the synagogue walls, no invitations sent through the mail, nor even a report in any publication, including this very newspaper.”

The wedding lasted more than four hours, the Times reported. Representatives of the Yetev Lev D’Satmar congregation did not respond to The Washington Post’s request for comment as of early Wednesday morning.

On Sunday, New York Gov. Andrew M. Cuomo (D) blasted the synagogue over the event, calling it a “blatant disregard of the law” that was “disrespectful to the people of New York.”

If the event’s organizers kept it “secret” due to the state health commissioner’s move to block October’s wedding at the synagogue, he said, that act of defiance would be “shocking.” The governor was also skeptical that local officials wouldn’t have been alerted to such a large gathering.

“If 7,000 people went to a wedding, you can figure that out right?” Cuomo said. “That’s the problem with a ‘secret’ 7,000. It’s hard to keep a secret."

But on Tuesday, de Blasio said authorities had no prior knowledge of the event. De Blasio said the city is still investigating how many people actually attended.

Asked if a $15,000 fine would be enough to deter people from convening at the synagogue again, the mayor said a cease-and-desist order had also been placed in the building, which could be shut down permanently if “inappropriate activity” were to occur again.

“We need to be very, very clear that if folks are doing something dangerous, we can’t allow it to happen,” he said.

Superspreader events are the leading cause of coronavirus transmission in the U.S. Here’s what they entail, and why they are so dangerous. (The Washington Post)