![202004bhr_bigdata_coronavirus](/sites/default/files/multimedia_images_2020/202004bhr_bigdata_coronavirus.jpg)
People in a crowd check their cellphones, months before the coronavirus pandemic began. Now, a few months into the pandemic, governments worldwide are increasingly using surveillance to try to curtail the spread of the disease, including by tracking people’s movements with aggregated cellphone location data.
© 2019 GDA via AP Photo