The money came from a settlement with the city over Ydanis Rodriguez's Occupy Wall Street arrest.
DOC Commissioner Joseph Ponte said the department needs better facilities to fix conditions at Rikers.
The fundraiser is expected to raise money for 100 local charities.
Bratton made a case for more police during City Council budget hearings.
Protesters repeatedly interrupted Bratton's budget testimony Thursday morning, police said.
The revelation contradicts what a City Hall official previously told DNAinfo New York.
The groups called for more involvement in the city's rezoning process.
The firebrand PBA boss should have been more conciliatory with the mayor, his would-be replacements say.
The plan would have deleted emails from 14 city agencies after 90 days, but it was never implemented.
The program will be rolled out in 100th and 101st precincts in Rockaway and the 33rd and 34th Uptown.
The de Blasio administration has tried to harness social media to reach New Yorkers directly.
Four out of five police unions have reached a contract with the city.
The hack may have been worse than first thought, sources said.
Photographer Natasha Jahangir chronicles City Hall unions in "Married in New York."
The "universal" attack left all agencies unable to receive messages.
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