Thomas' Development Blog has a story about how someone was blocked from Google Groups for three years and how it was finally remedied.
He could not administer his own group. He could not read other groups including google help.
http://lobais.blogspot.com/2010/05/when-google-locked-door.html

slashdot coverage: http://yro.slashdot.org/story/10/05/31/0151202/Where-Do-You-Go-When-Google-Locks-You-Out?from=rss&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Slashdot%2Fslashdot+%28Slashdot%29&utm_content=Google+Feedfetcher