1.   But Chubais, too, has critics who say he himself has concealed knowledge of contract murders for murky political goals.

2.   He participated in hearings on whether tobacco companies concealed knowledge that their product is addictive.

3.   In February, the charge against him was reduced from plotting the coup to concealing knowledge of the plot.

4.   It charges that they concealed knowledge that nicotine is addictive, and that they manipulated the levels of nicotine in cigarettes to keep customers addicted.

5.   Last week, Sicignano pleaded guilty to concealing his knowledge that crimes had been committed.

6.   Last year Intel suffered a public relations and financial setback after consumers learned that the company had concealed knowledge of a rare math flaw in its Pentium chip.

7.   Other states filed such lawsuits, accusing the tobacco industry of concealing knowledge about the harmful effects of smoking.

8.   The lawsuit contended that the tobacco industry had concealed knowledge that nicotine was addictive and had manipulated nicotine levels in cigarettes to keep smokers addicted.

9.   The suit charges that they concealed knowledge that nicotine was addictive, and that they manipulated the levels of nicotine in cigarettes to keep customers addicted.

10.   They also said the companies and two tobacco trade groups fraudulently concealed their knowledge that their cigarettes were addictive.