“Management and management oversight in one hand.” Combining monitoring and management roles into one job held by one manager supposed to check themselves.
There can be overlap in groups as well. Apparently the board of directors running a German company and the supervisory board (Aufsichtsrat) that monitors the board of directors may not contain the same people, but this exclusion does not apply in the USA where, writes the F.A.Z., e.g. when the supervisory board approves the compensation of the management board, people who happen to be in both groups will at best merely abstain from voting.
(Geh SHEFTS foor oong oond OW! f sichht in eye ner Hond.)