machine picks up they hang up

Caller id says from  glen cove ny

Called 8/27/12, 5:09pm.  Caller ID reads "C4C FOP NY."  Who are these people?  As soon as machine picked up, I got a dial tone.  Jerks.

Showed up on my caller ID as unknown name.  I didn't answer and they didn't leave a Voice Mail either.

These are scammers - big time.  Seems they're starting their calls again.  They pretend to be the Fraternity of Police Officers.  This time I picked up, told them my precinct said they were scammers, and the police do not call for contributions; also I was on the DNC list and to stop harrasing me.  They slammed the phone.