It is the third year in a row that members of the transit police will attend the block party, which BART Board Member Robert Raburn, who will also participate, said involvement builds community.
Members of BART's Community Policing section collected Halloween costumes to distribute to children attending the annual party on East 27th Avenue between Foothill and International Boulevard.
The cleanup begins at 11 a.m., and police officers will begin giving away the costumes at 1 p.m., according to organizers.
The Oakland Police Chief and staff and members of Councilman Ignacio De La Fuente's office are also expected to attend, along with Oakland school district members and children of the San Antonio neighborhood.
The party is taking place in the same neighborhood where the fatal shooting of an unarmed BART passenger in 2009 led to criticism of the transit police.
Oscar Grant III was shot on New Year's Day 2009 at the Fruitvale station by a BART police officer who was eventually charged with involuntary manslaughter.
The transit police were not the only law enforcement distrusted by the larger surrounding community. Members of the community also scrutinized the city's police force following an officer-involved shooting that killed an unarmed man last November.
A month later, Mayor Jean Quan said that the City of Oakland needed to regain the confidence of the community in the wake of the incident.
Organizers did not respond to a request this morning seeking comment.
Raburn, who represents the Fruitvale area on the BART Board, said he is looking forward to participating in the cleanup.
"Involvement in simple volunteer tasks builds community," he said in a statement this week.