People who enter a country illegally or over stay an entry visa. They in most cases do want to asimilate into the society of the country they are illegally staying in. They steal jobs and benefits from the true countrymen. They think they are more special and deserve special treatment and laws should be made to serve their law breaking. They are allowed to break laws that real citizens could not get away with. They care only about themselves.
In America the majority of crimigrants are Spanish speaking.
In Europe the majority of crimigrants are Arabic speaking.
Crimigrants use forged paper work to get jobs.
Crimigrants can break the law freely.
Look up the term Criminalien for a better definition.
Criminaliens and crimigrants have the same meaning. It depends on your preference.