When a high official gets involved in wrongdoing, it's usually the cover up that gets him in big trouble.

 The Democrats were 'circling the wagons' when Finis Smith was convicted. They knew it could lead to election losses. When several Democrats wrote to the judge in the Finis Smith trial, they begged for leniency for Smith. That revelation jeopardized several Democrat elected officials.

  Well, evidently some operatives thought it would be good strategy to make the Republicans look like their prosecutions were politically motivated. So another Republican federal prosecutor was targeted for a Democrat dirty trick. A letter was forged with the signature of Federal Prosecutor, Layn Phillips. The Federal investigation traced the source of the letter to a typewriter in Democrat mayor Terry Young's office. Everyone denied involvement and nothing was ever proven.

 Tulsa World said;

One of the biggest stories of 1986 was the so-called "Lettergate" scandal, which toppled Mayor Young's administration. After various public officials, including Young, wrote letters urging leniency for the Smiths, two subsequent letters with then-U.S. Attorney Layn Phillips' named forged on them surfaced. The forgeries suggested Phillips would release names of Democratic officials who had written leniency letters in an effort to damage them politically.
  The forgeries were linked to a typewriter and letter found in Young's office. Young and his staff denied any involvement, and a federal grand jury and special prosecutor left the case unresolved. But the incident no doubt led to the defeat of Young by political newcomer Tom Quinn in a March primary. 

 Senate President, Finis Smith, of West Tulsa, was caught with an unreported foreign bank account which he's not reported on his taxes. He and his wife both were sentenced to prison. They owned a Tag Agency. He was disbarred from his law practice.

  Former Oklahoma Senate  president pro-tem Finis Smith, along with his wife Doris,  were convicted by a federal court jury here on felony counts  of mail and tax fraud, conspiracy and failure to disclose foreign bank accounts. Finis and Doris Smith, each got six years, and were sent to a federal prison in Texas.

The Oklahoma Speaker, Dan Draper, was convicted in 1983 for election tampering. He was trying to help his father win a seat in the Oklahoma legislature.

The Tulsa World reported; 1983

  Dan Draper ended up in more trouble. He was arrested in February when a police officer found him slumped over the wheel of his car. He pleaded no contest to actual physical control while intoxicated, a charge later amended to a lesser offense after a year of probation.