Among the work featured in the exhibition Pop América, 1965–1975, running at Northwestern University’s Block Museum in the Chicago suburb of Evanston through December 8 is, above: Antonio Dias, “The Illustration of Art / Uncovering the Cover-Up,” 1973. Screen print and acrylic on canvas, 35.82 x 53.54 inches (91 x 136 cm). Courtesy of the artist and Galeria Nara Roesler, New York, New York, and Rio de Janeiro, Brazil. © Antonio Dias. The Newsweek cover — dated May 28, 1973 — features “Senator Sam” Ervin, chair of the Senate Select Committee to Investigate Campaign Practices then investigating the White House cover-up of the 1972 break-in of Democratic campaign offices in the Watergate Hotel, which hearings might have lead to the impeachment of President Richard Nixon had he not resigned. 20 years earlier, Ervin had been appointed by then vice president Nixon to a committee charged with investigating Senator Joseph McCarthy. For more on presidential impeachments — and McCarthy — click here.