New York City's top progressives have backed away from any direct confrontation with the city's largest police union, even as union leaders continue to criticize the mayor following the shooting of two officers.

But the silence of non-police unions may not last long into the new year.

That will depend on the actions of Patrick Lynch, the president of the Patrolmen's Benevolent Association, and whether he continues his public campaign against Mayor Bill de Blasio, sources with knowledge of union thinking say. Unions were instrumental in getting de Blasio elected and are considered among his closest allies.

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The city's police unions are not members of the AFL-CIO, unlike many of New York City's largest unions.