The best-known and fastest growing group is Prison Fellowship, founded by former White House official Chuck Colson in 1976. In spite of its volunteer and apparently laudable nature, there are many critics of the prison ministry movement, including security officers and prison officials concerned about the strain on security created by outsiders, prisoners who do not value the spiritual attention they receive, and even church organizations who question the methods used by largely evangelical volunteer groups. Some groups use mass conversions to raise funds for their operations. Despite the criticisms, prison ministry has changed many inmates' lives through their conversions. Prison ministry programs often become involved in public policy debates over prison reform. Groups representing other religions and movements also enter the prisons to provide for the needs of their congregants. An essential part of any prison ministry must be follow-up work to help released inmates readjust to society.