Opposition to Gas Drilling Lands Mark Ruffalo on a Terror Watch List

Actor Mark Ruffalo has been placed on a terror advisory list by U.S. officials after organizing screenings for a new documentary about natural gas drilling.

The "Zodiac" actor arranged showings for "GasLand" earlier this year and voiced his concerns about the practice in relation to the national water supplies.

But his efforts to raise awareness and demand a stop to natural gas drilling reportedly attracted the attention of officials from Pennsylvania's Office of Homeland Security – and he recently discovered it had landed him on a terror alert watchlist.

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