Shares of private prison operators ended lower Monday after Fifth Third Bancorp (FITB) - Get Report joined a growing list of financial services companies to cut ties with the industry.

The Geo Group, Inc. (GEO) - Get Report fell 22 cents to close at $18.86. CoreCivic, Inc. (CXW) - Get Report fell 25 cents to end at $17.93.

Shares of both prison operators have been under pressure since Sen. Elizabeth Warren, D-MA, said last month she would move to ban private prisons if elected president.

In addition to Fifth Third, JPMorgan Chase & Co. (JPM) - Get Report , Bank of America Corp. (BAC) - Get Report , Wells Fargo & Co. (WFC) - Get Report , SunTrust Banks Inc. (STI) - Get Report and BNP Paribas (BNP.PA) have all indicated they will back away from the industry.

Geo Group and CoreCivic have received substantial contracts from the Federal government to provide prison and detention services, including in connection with U.S. Immigration and Customs Enforcement.

Real Money Pro contributor Jon Heller recently noted that prison operators have come under fire in the past, notably during the 2016 presidential election, only to rebound sharply after President Donald Trump's election.

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