In particular, he was vigorously combated by St. Ephrem. He also combated against the Donatist heresy, popular particularly in North Africa at the time. She also became involved in various groups and organizations that combated racism and sexism. Dietary deficiencies in developing countries can be combated by promoting better eating practices. Later Franz Boaz perhaps even more strongly combated the theory of white supremacy. Exploitation and abuse of children should be actively combated, including by addressing their root causes. It is often combated using preventative measures, typically through vaccination. Mahathir combated it initially with IMF approved policies. Crime in Switzerland is combated mainly by cantonal police. Crime in Greece is combated by the Hellenic Police and other agencies. Resistance to common fungicides is currently combated through the use of other chemicals. Crime in Finland is combated by the Finnish police and other agencies. Crime in Spain is combated by Spain's law enforcement agencies. Crime in Poland is combated by the Polish police and other agencies. Crime in Portugal is combated by the Portuguese police and other agencies.