If you’re a male who plans on taking the metro around St. Petersburg, Russia, you might want to be wary of how you sit as you ride.

A feminist may be lurking alongside you, ready to punish you for any lax posture you may exhibit.

“Feminist activist and Russian law student Anna Dovgalyuk has taken to pouring a bleach and water mixture on the crotches of unsuspecting men on the St. Petersburg Metro for their anti-feminist sin of ‘manspreading,’” The Daily Caller is reporting.

Dovgalyuk can be seen on video spilling the mixture contained in a water bottle onto more than 60 men, and while most are too shocked to react — a few attempt to confront her for her dangerous actions (bleach is definitely not recommended for contact with human eyes or skin).

“This solution is 30 times more concentrated than the mixture used by housewives when doing the laundry,” she claimed in the video, says The Sun. “It eats colors in the fabric in a matter of minutes — leaving indelible stains.”

“Manspreading” is a “disgusting act that is being fought around the world — but hushed up here,” she added.

She spread her bad behavior further with the help of Instagram, noted The Daily Caller.

“This is my new video manifesto, dedicated to the problem of manspreading,” she posted to the popular app.

“The disgusting act that is being fought with around the world and it is hushed up in us. Men demonstrating their alpha-manhood in the subway with women and children around, deserve contempt. If you publicly show what kind of macho you are, we will publicly cool you off!”

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It is not clear how the young woman armed with bleach is fighting on behalf of the sisterhood by potentially injuring unsuspecting men using public transportation.

But any male would be wise to keep his eyes peeled — and his legs crossed — while using the St. Petersburg metro.

See this woman in action in the video below.