Chinese gender imbalance

It is significant that Nature has taken up the question of the now dangerous gender imbalance in China caused by the infamous "one child policy". (Cf. Where have all the flowers gone?)

At one point, the the article says:

The unsupportable nature of the modern population boom led China's then leader, Deng Xiaoping, to introduce in 1979 the one-child policy, which nearly all citizens were supposed to observe. Financial incentives were provided for compliance; failure to do so drew fines and confiscations of property, and in some cases led to enforced abortions.

Forced abortions? I though we weren't supposed to admit that they happened.