“The Bastard Sons” (*1/2 out of four) was a tediously derivative underworld thriller about a group of tight-knit blue-collar friends (Kevin Interdonato, Charles Malik Whitfield, Frankie Edgar, and others) who seek revenge by any means necessary when one of their own is killed by an integral member of the mob. A vanity project for write/director/star Interdonato who obviously spent much of his formative years watching too many Scorcese movies (“Mean Streets” in particular) and also Rob Cohen’s “Amongst Friends.” Low-rent all the way through and ends pretty abruptly, if you even make it that far.