Socialism has that effect.

Britain is experiencing the worst “brain drain” of any country as highly qualified professionals settle abroad, an authoritative international study showed yesterday.
Record numbers of Britons are leaving – many of them doctors, teachers and engineers – in the biggest exodus for almost 50 years.
[…]
No other nation is losing so many qualified people, it points out. Britain has now lost more than one in 10 of its most skilled citizens, while overall only Mexico has had more people emigrate.
[…]
Damian Green, the shadow immigration minister, said: “Ten years of Labour has re-created the brain drain. High taxes and Government interference are driving people away.”