In 1968, an underground, anti-war short film was produced by Lee Savage and Milton Glaser called Mickey Mouse in Vietnam.
The short (unofficially) starred Mickey Mouse in a one minute animation that depicted the Disney icon travelling to Vietnam in a boat, entering the country, and being immediately shot in the head. The film was shown to associates of the creators in 1970 and onward. It is rumoured (though unconfirmed) that Disney tried to destroy every copy that they could get in their possession.
To explore further:
The design of dissent / by Milton Glaser and Mirko Ilic – NX650.P6 G53 2005
The great anti-war cartoons / edited by Craig Yoe ; introduction by Muhammad Yunus ; foreword by Sara W. Duke. – NC1763.W3 G74 2009
The Pirates and the mouse : Disney’s war against the counterculture / Bob Levin. – KF3080 .L48 2003
Free culture : the nature and future of creativity / Lawrence Lessig – KF2979 .L47 2005