It has blocked only seven corporate ventures since 1990, however, preferring instead to request changes and then give the green light.

Shuttered installations mean lost jobs among voters, and Congress has blocked any base closings since 1977.

The University's plans for airport closure have been blocked in the state legislature on at least three occasions since the 2000 announcement.

Congressional Republicans have blocked any change in the standards since 1995.

The land route to the west was blocked since early March.

A ballot initiative to do that, Proposition 187, has been blocked by legal challenges since its approval in 1994.

But responding to protests from California, Congress has blocked all leasing efforts there since 1982.

It was this decision that broke the principal barrier that had blocked final passage of the bill since last year.

This proposal for a directive has been blocked in the Council since November 2007.

Roughly $68 million in financial assets of terrorists has been blocked worldwide since the attacks.