The post-rural purge shift to shows with urban settings wasn't mutually exclusive with blue collar shows, though. Sitcoms like All In the Family, Sanford & Son, MASH, Laverne & Shirley, Welcome Back Kotter, Good Times, and Taxi were all blue collar shows that launched and flourished in the '70s, for example. In fact, sitcoms in general started to get edgier and more topical during that decade - All in the Family was fairly controversial in its time, especially to viewers who had become accustomed to the relatively tame and saccharine family comedies of the '50s and '60s.