Suffolk County Police Commissioner Timothy Sini is scheduled to testify Wednesday before a congressional panel in Washington that is investigating the rise and influence of MS-13 on Long Island, Suffolk police said.

Sini has been asked to outline Long Island’s experience with that notorious gang and others at a hearing entitled “Border Insecurity: The Rise of MS-13 and Other Transnational Criminal Organizations” before the Committee on Homeland Security and Governmental Affairs at 10 a.m. in the Dirksen Senate Office Building.

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The hearing comes as Suffolk authorities, and residents in particular, grapple with the apparent rise in the gang’s brutality and killings. In April, the mutilated bodies of four teenage boys and young men were found in a Central Islip park, murders that Sini said bore the mark of MS-13.

Months earlier, in September, the bodies of two teenage girls were found similarly brutalized on a Brentwood street. That double murder sparked a multiagency crackdown by Suffolk police and federal law enforcement agencies that led to the arrests of about 200 MS-13 members on local and federal charges, including Racketeer Influenced and Corrupt Organizations (RICO) offenses.

A string of other unsolved murders in Suffolk has been attributed to the gang over the past year.

“During his testimony, Sini is expected to describe recent trends of transnational gang-related activity in the SCPD’s jurisdiction; factors he believes are contributing to the rise of gang activity in the community; the challenges the Department faces in combating gang activity; and the important partnership between the Department and residents of the affected communities,” Suffolk police said in a news release announcing Sini’s visit to Capitol Hill.