The Sanctions Card reduces the income of another player. When playing a Sanctions Card, you can pick any player as the target.
Sanctions can be configured to reduce their target's income to 0 or to a particular percentage of their income. The default configuration removes half of their income (50%).
Sanction cards can stack. If two sanction cards are played on the same player, they will be applied consecutively. For example, if the first 50% sanction card reduces your 20 income to 10, a second would reduce the remaining 10 to 5.
 Negative sanctions
If the sanctions card is configured to reduce income by a negative percentage, it will actually increase the target's income.
Note that negative sanctions cards can never increase someone's income to higher than 10,000.