20 fire companies would be eliminated under the Mayor's preliminary 2013 budget.
Three fire companies in Manhattan are among 20 on the chopping block citywide.
"Help us SAVE THE GHOSTBUSTERS!" the group's Twitter account reads.
Agencies across the city are warning that the new cuts will compromise safety and hurt children and seniors.
Cuts include 6,166 teaching positions, 350 civilian police positions and layoffs at numerous departments.
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