Hollywood writers marked the 100th day of their industry-crippling strike on Wednesday, dubbing the occasion a "milestone of shame" for studios as the two sides remain deadlocked.

Film and television writers walked out back in May over demands for better pay and residuals, guarantees over the future use of artificial intelligence, and other working conditions. 

The Writers Guild of America (WGA) strike swiftly brought countless film shoots and productions to a halt, costing the industry millions of dollars each day, but the two sides have barely spoken since.

The chaos wrought on the entertainment industry deepened last month, when writers were joined on the picket lines by the far larger Screen Actors Guild (SAG), representing actors, who share similar demands. It is the first time both unions have gone on strike since 1960.

"The refusal to take writers' reasonable proposals seriously has caused the WGA strike to last 100 days and counting; it serves only as a milestone of shame" for the studios, the WGA told AFP on Wednesday.

The studios "are wholly responsible for the over three-month shutdown of the industry and the pain it has caused workers and all others whose livelihoods depend on this business," said a union statement.

Writers and studios tentatively met last Friday to discuss formally reopening talks for the first time since May, but the sitdown has not yielded any tangible results.

On the picket line outside Netflix's offices Wednesday, screenwriter Charlie Kesslering said the strike is an "existential fight," noting that "it's going to take a lot more than 100 days for the motivation to go away."

Recently, the United States has experienced an unprecedented surge in union activities and strikes, as workers across multiple industries take matters into their own hands.

On Tuesday, thousands of city workers in Los Angeles went on a 24-hour strike to protest what their union calls bad-faith bargaining by city officials over a new contract.

(With input from agencies)