Charter schools are problematic. They are privately owned schools that operate independently of the established public education system in which they are located, and they receive government funding that is set for public schools. One of the leading opponents of this privatization of public assets is the Network for Public Education led by Diane Ravitch. See the following for a statement of their view on charter schools: https://dianeravitch.net/2017/06/01/the-network-for-public-education-our-view-on-charter-schools/