Stanislaus Grzeskowiak, of North Pole, is charged with felony extortion and threatening harm. He was in jail Tuesday on $2,500 bail. Sgt. Jess Carson says the 36-year-old called state troopers Friday and said he knew how to use discarded televisions to make devices that could block police radios, computer communication and cellphones. He also threatened to cut the communications of oil companies and credit card companies if he didn’t get the money. Authorities say Grzeskowiak blames the state and companies for his financial situation, lack of education and marital problems. Grzeskowiak is represented by the public defender’s office. Officials there didn’t respond to requests for comment.