Click here to access article by Jay Cassano from Jadaliyya.
The weapon of choice for most ruling classes to control and oppress their citizens is their use of tear and CS gas. Profit-making corporations will tend to produce whatever brings in their profits and will sell to anybody willing to buy these products. This piece provides some information on the profit-making corporations that supply these regimes.
To supplement this piece, I recommend that you see the graph at this link (in place of the one in the article) regarding the connections between the corporations and their national regime customers, and this link from Wikipedia showing the five major corporate suppliers.