The main difference is, the target. A group can terroroze their own community, no problem. The second it affects the Governemnt, watch out.
Best example, home evasion in Florida, 34 months.
Tax evasion such as filing a fraudulent return, can land you in prison for 5 years. Failure to File a Return: Failing to file a return can land you in jail for one year, for each year you didn't file.