A suspected random serial slasher who cuts men on the left side of their face is on the loose in Brooklyn, law-enforcement sources said Sunday.

The suspect launched three bloody attacks over the weekend, beginning around 6:30 a.m. Saturday on a northbound Q train at the Church Avenue subway station, when a 37-year-old straphanger was slashed in the left side of his face, sources said. 3

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Cops responded to a 911 call at the scene and rushed the victim to Kings County Hospital, where he was listed in stable condition, according to police.

Then at 9:40 p.m. Saturday, the same fiend apparently struck again, attacking a 53-year-old man at the intersection of Foster Avenue and New York Avenue — again leaving the victim with a slash to the left side of his face, sources said.

He was al

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