Six Flags reserves right to kick out sex offenders
Here we have another example (see below) of private property-based exclusions of undesirables.

CHICAGO - Six Flags is warning convicted sex offenders that they're not welcome. The amusement park has added a message to its season passes stating that it can refuse entry to anyone convicted of a sex crime. Six Flags doesn't actually plan to run background checks on everyone who enters its 30 theme parks. However, visitors seen acting inappropriately could be subjected to a check and thrown out. A Six Flags spokeswoman says the warning was added on the advice of the company's attorneys. A ride operator was sentenced to prison in 2000 for molesting three girls. The company has paid nearly $1.5 million to two of the victims.