According to a 1966 survey of Portland police, 86 percent of officers believed that the civil rights movement was ‘moving too fast,’ and more than half believed racial equality was happening ‘much too fast.’…
Civil rights and anti-poverty organizations’ criticisms of the police
reflected the growing frustration that many young Albina residents felt —
a frustration that erupted in the summer of 1967 in Irving Park.
Young people threw rocks and bottles at the police, and the disturbance quickly
moved to nearby Union Avenue, where fires were set, windows were broken,
and a stereo store was looted. Unlike later riots in Albina, the Irving Park
disturbance was not sparked by a specific incident. Young participants were
frustrated by unresolved problems in their community and especially by the
constant police presence. One rioter commented:
Where else but in Albina do cops hang around the streets and parks all day like plantation overseers? Just their presence antagonizes us. We feel like we are being watched all of the time.
After the Irving Park riot, police increased their surveillance of Albina
neighborhood activists and meticulously recorded any confrontations they
had with young black residents, often referring Albina youth to the Intelligence Division. 
From Black and Blue: Policy Community Relations in Portland’s Albina District, 1964-1985, by Leanne C. Serbulo and Karen J. Gibson