This movie let's you feel the energy and emotions of that moment. It is really intense and makes one wonder how he got out at the end without being harmed. An important historic document.
It is the first Social Protest Documentary Film of the 60s Movement. Dan Drasin told us at the end that he got his equipment and film stock from his collaborating friends D.A. Pennebaker and the Maysles Brothers. So this really was a time where people were able to go out and do something within a short time (with a little help from their friends).
At the Vienna International Film Festival it was shown together with his short film "X" from 1962 [a gem, which makes it even more a shame that it isn't even listed on IMDB's database](and Robert Frank's "Pull my daisy"), that shows his talent of telling a story with a "message" in an effective and amusing way.
Hopefully somebody like the Criterion Collection is able to collect them together with some other short films of that period and releases them on DVD.