IAD TRACON HAD AN ACFT FLY THROUGH DEP AIRSPACE WITHOUT A HDOF OR POINTOUT WHICH DISRUPTED DEP TFC.

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B727 DEPARTED IAD AND WAS CLBING WBOUND. MO20 WAS NBOUND FROM APPROX CSN VOR TOWADS MRB VOR AT 6000 FT. W ARR WAS WORKING MO20 AND FLEW HIM THROUGH DEP AIRSPACE WITHOUT HDOF OR POINTOUT. I TRIED TO AVOID THE MO20 WITH THE B727 AT FIRST. I GOT REALLY BUSY WITH MY OTHER ACFT; FORGOT ABOUT THE MO20; I DIDN'T SEE HIM AT FIRST; AND THEN CLB MY B727. (I WAS CLBING IN MY AIRSPACE.) I ASKED FOR HELP BEFORE INCIDENT HAPPENED AND DIDN'T RECEIVE ANY. I STOPPED DEPS AND THAT HELPED SOME. IF W ARR DID NOT RUN THAT MO20 THROUGH MY AIRSPACE; NONE OF THIS WOULD HAVE HAPPENED AND YOU WOULD NOT BE READING THIS. SUPPLEMENTAL INFO FROM ACN 448851: I RPTED L TO 270 DEGS AND THAT WE WERE EXPEDITED TO 11000 FT MSL. THE CTLR IMMEDIATELY SAID TO GO BACK TO 5000 FT MSL AND RPTED MOONEY TFC AT 12 O'CLOCK POS AND 6000 FT MSL. WE VISUALLY ACQUIRED THE MOONEY AS HE CALLED IT; MOVING L TO R AT 12:30 O'CLOCK POS; 200 FT ABOVE US FROM TCASII AND APPROX 4 NM OUT. WE GOT AN RA TO CLB. SO; WE KEPT THE MOONEY VISUALLY AND CLBED IN THE GREEN ARC IN THE RA/VSI FOR THE RA. I IMMEDIATELY RPTED THE MOONEY VISUAL AND THE RA CLB. THE CTLR REPLIED; KEEP THE MOONEY IN SIGHT AND CLB TO 11000 FT MSL. WE PASSED APPROX 3 NM BEHIND AND 600 FT ABOVE THE MOONEY.