I will dispense with dates, but here are a bunch of guys that you wouldn't want your sisters or daughters to get involved with.

Young psycho killers – faces you never forget.
Kiss Of Death (Richard Widmark)/Mad Dog Coll (John Davis Chandler)

Bad Bob Mitchum X2
Night Of The Hunter/Cape Fear

Scary tough
D.O.A./Kansas City Confidential (Neville Brand)

Can’t forget Timothy.
Crime Wave/Finger Man (Tim Carey) Make it a Tim triple bill and throw in Bayou.

Sometimes a nice guy, but. . .
The Dark Corner/The Glass Key (William Bendix)

Letting others do the dirty work.
The Killers/Destination Murder (Albert Dekker)

The law turns sour.
I Wake Up Screaming (Laird Cregar)/Pushover(Fred MacMurray)

A double dose of Danny D
Criss Cross/Scarlet Street(Dan Duryea)

The closest there is to the “King of Noir” –
Bad Day At Black Rock/Beware,My Lovely(Robert Ryan)

A creepy guy to be around.
Johnny Allegro/A Lady Without Passport(George Macready)

Behind those smooth good looks
The Night Runner/The Big Operator (Ray Danton)

Good guys, bad guys, he played them all.
The Threat/T-Men (Charles McGraw)

Finally, classic era noir relied on this guy.
Red Light/The Whip Hand (Raymond Burr)