Hundreds gathered in downtown Los Angeles on Monday to call for the release of a union leader who was arrested at an immigration enforcement operation last week.

David Huerta, President of Service Employees International Union-United Services Workers West, was arrested during the operation. In a , U.S. Attorney Bill Essayli said that Huerta "deliberately obstructed" federal officers by blocking their vehicle during the operation.

Huerta was injured during the arrest and was treated at a local hospital before being transported to the Metropolitan Detention Center in downtown L.A. 

"What happened to me is not about me; This is about something much bigger. This is about how we as a community stand together and resist the injustice that's happening. Hard-working people, and members of our family and our community, are being treated like criminals," Huerta said in a statement afterwards. "We all collectively have to object to this madness because this is not justice. This is injustice. And we all have to stand on the right side of justice."

On Monday morning, Huerta was federally charged with conspiracy to impede an officer. The felony charge carries a possible six-year federal prison sentence if convicted. He's scheduled to appear in court later Monday, though he isn't expected to be arraigned during that hearing.

Huerta was released following his court appearance after posting $50,000 bond, according to the U.S. Department of Justice. His next appearance is scheduled for July 7 in downtown L.A.

SEIU shared a statement shortly after he was released. 

"We are relieved that David is free and reunited with his family and we are deeply grateful to the hundreds of elected officials, civil rights leaders, labor partners and allies from across the nation who stood in solidarity and demanded David's release," the statement said. "But this struggle is about much more than just one man. Thousands of workers remain unjustly detained and separated from their families. At this very moment, immigrant communities are being terrorized by heavily militarized armed forces. The Trump regime calling in the National Guard is a dangerous escalation to target people who disagree with them. It is a threat to our democracy. The federal government should never be used as a weapon against people who disagree with them."

Authorities told CBS News Los Angeles that Huerta was being "physical" with officers before his arrest, leading to an aggressive detainment.

During Monday's peaceful rally, SEIU 2015 President  said that Huerta had a legal right to be present during the operation.

"Everyone has the right to observe immigration enforcement peacefully," he said. "That's the right that everyone has."

Luis Nolasco, a member of ACLU 39, said Huerta was unjustly arrested.

As of Monday, it's not clear if Huerta will be released from custody after his court appearance.