The Federal Election Commission is examining whether dozens of political action committees and individuals contributed more than the legally allowed amount to House Speaker John Boehner during last year's election cycle.

Letters the Federal Election Committee sent Monday to

indicated that donors including coal, energy, and gambling interests, exceeded contribution limits to Boehner's committee by more than $150,000.

Among the groups that were allegedly overgenerous to Boehner were Coalpac and Minepac, which represent the mining industry, as well as political committees representing the Exelon, Constellation and Luminant power companies, and the Ceasars and Penn National gambling enterprises.

"Although the commission may take further legal action concerning the acceptance of excessive contributions, your prompt action to refund the excessive amount will be taken into consideration," the letters say.

Friends of John Boehner is one of several political organizations that Boehner uses to raise money for GOP candidates and solidify his party's control over the U.S. House of Representatives.

compiled by the Center for Responsive Politics list him as the top fundraiser in the House of Representatives during the 2012 election cycle, raising more than $22 million.

Boehner spokesman Cory Fritz said large committees like Boehner's that process quarterly contributions from "thousands of grassroots supporters each quarter routinely handle these questions."

"We take compliance with FEC rules and regulations seriously, and will take all corrective action necessary," said Fritz.