You can leaflet and invite people of the general population for years to find one who can see through the smoke, the patriotism/nationalism, the religious affiliation, the sports fanaticism, the PC verbalism-activism
You can dig in to a more specific sample, the most oppressed, abused, exploited, the really trully needy, .. and you may end up with a black eye
So then you dig even more, the people who are generally active already, active in unions, in anti-cap parties, ......