GR translation: cover company

[Mike Jing]

P253.30-40   Jamf at the time was working for a Swiss outfit called
Psycho-chemie AG, originally known as the Grössli Chemical Corporation, a
spinoff from Sandoz (where, as every schoolchild knows, the legendary Dr.
Hofmann made his important discovery). In the early ‘20s, Sandoz, Ciba, and
Geigy had got together in a Swiss chemical cartel. Shortly after, Jamf’s
firm was also absorbed.
Apparently, most of Grössli’s contracts had been with Sandoz, anyway. As
early as 1926 there were oral agreements between the Swiss cartel and IG
Farben. When the Germans set up their cover company in Switzerland, IG
Chemie, two years later, a majority of the Grössli stock was sold to them,
and the company reconstituted as Psychochemie AG.

What exactly is a "cover company"?
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