The last robbery was about a week ago when someone walking alone was robbed at gunpoint.
The neighborhood watch committee said they are trying to do everything they can to make the area safer.
"They're tense. We have the phones ringing off the hook," said Melvy Murgula from the Melrose Action Neighborhood Watch. "In fact, one of our cofounders Peter Nichols, right in front of his house, there was a robbery that took place," she said.
Katan Khaimov, 70, was going for his daily stroll back in March when he was attacked and stabbed to death. No one has been arrested for his murder. There is nearly a $70,000 reward offered for information that leads to an arrest.
One of the things the neighborhood watch committee is urging is for people to be out and about, walking the dog, going for a walk, but don't do it alone.
They figure the more eyes and ears on the streets, the quicker they'll be able to nab the three suspects police are looking for.
The suspects are described as black, in their mid to late 20s.
Anyone with information is urged to call LAPD's Hollywood division at (213) 972-2967.
Eyewitness News reporters Sid Garcia and Subha Ravindhran contributed to this report.