359 foreigners convicted of murder or manslaughter entered UK. 239 foreigners convicted of rape entered UK. 313 foreigners convicted of child sex offenses entered UK. Up to 911 total serious foreign criminals identified after UK arrests. 409 came from Romania alone. Most offenders from Eastern European countries. Criminals slipped in via lax EU passport checks. Convictions only uncovered after new crimes in UK. Examples include Polish killer who raped after UK entry. Lithuanian murderer dismembered partner after prior homicide conviction. Another Lithuanian beat man to death before UK attack. Foreign criminals not monitored post-release like UK lifers. ACRO checked 315,228 records revealing these entries. Total foreign offenders likely thousands as data covers only serious cases post-arrest. Home Office claims rigorous checks but criminals still entered. Shadow Home Secretary demands immediate deportation of all foreign criminals. Reform UK calls for deporting 11,000 foreign national offenders in custody.