This article explores the role of place managers in controlling drug a
nd disorder problems on 100 street blocks in Oakland California. We us
e self-reports from a sample of place managers to explore their role i
n changing the social and physical conditions of street-block activity
within the context of a randomized field trial in Oakland. On-site ob
servations of the changes in the social and physical conditions of 100
street blocks were conducted and used as our outcome measures. Our re
sults suggest that street blocks where place managers engaged in colle
ctive crime control activities had significantly fewer signs of disord
er and greater levels of civil behavior Our results also show that com
munity cohesiveness on a street block was associated with fewer males
selling drugs.