PORTLAND, Oregon (Reuters) - An Oregon anti-terrorism bill would jail street-blocking protesters for at least 25 years in a thinly veiled effort to discourage anti-war demonstrations, critics say.

Dubbed Senate Bill 742, it identifies a terrorist as a person who "plans or participates in an act that is intended, by at least one of its participants, to disrupt" business, transportation, schools, government, or free assembly.

The bill contains automatic sentences of 25 years to life for the crime of terrorism.

Critics of the bill say its language is so vague it erodes basic freedoms in the name of fighting terrorism under an extremely broad definition.

"Under the original version (terrorism) meant essentially a food fight," said Andrea Meyer of the American Civil Liberties Union (ACLU), which opposes the bill.