Condé Nast fired four unionized employees Wednesday after they confronted the company’s head of human resources over layoffs tied to the folding of Teen Vogue into Vogue.com — a move that union leaders say signals the publisher’s escalating crackdown on internal dissent.

The firings came two days after Condé announced Teen Vogue would be folded into Vogue.com under new editorial chief Chloe Malle.

The move effectively ended the youth title’s 22-year run as an independent brand — prompting the exit of editor-in-chief Versha Sharma and at least six other staffers.

Condé said the transition would “keep Teen Vogue’s unique editorial identity and mission.”

But insiders and the NewsGuild of New York, which represents Condé Nast employees, blasted the move as a deliberate effort to “blu

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