I read the wikipedia page. My first post was directly from the wiki.

They're Coming to Take Me Away, Ha-Haaa! has the distinction of being the song to drop the furthest within the Top 40 in a single week. It charted for 5 weeks during 1966; in week 3 it peaked at #3, scored #5 in week 4, and fell to #37 in week 5. This was due to radio programmers removing the song from their playlists, fearing an adverse reaction from people who might consider the song as ridiculing the mentally ill. This occurred most notably in the New York market, where both the New York Top 40 music radio stations of the time, WABC and WMCA, banned broadcasting of the song. (WABC continued to include the song on its local Top 20 list despite no longer broadcasting it.)[2]

Opposition to the banning saw teenagers picketing WMCA, carrying such signs as: "We're coming to take WMCA away! Unfair to Napoleon in every way." In contrast, a plane flying a banner protested WMCA's banning the record.